Dota 2 - Phantom Assassin (Mortred) Build Guide

BIO
Through a process of divination, children are selected for upbringing by the Sisters of the Veil, an order that considers assassination a sacred part of the natural order. The Veiled Sisters identify targets through meditation and oracular utterances. They accept no contracts, and never seem to pursue targets for political or mercenary reasons. Their killings bear no relation to any recognizable agenda, and can seem to be completely random: A figure of great power is no more likely to be eliminated than a peasant or a well digger. Whatever pattern the killings may contain, it is known only to them. They treat their victims as sacrifices, and death at their hand is considered an honor. Raised with no identity except that of their order, any Phantom Assassin can take the place of any other; their number is not known. Perhaps there are many, perhaps there are few. Nothing is known of what lies under the Phantom Veil. Except that this one, from time to time, when none are near enough to hear, is known to stir her veils with the forbidden whisper of her own name: Mortred.
INTRODUCTION
Mortred is a hero that have the biggest Critical Strike in DotA. She is a decent carry on late game. The critical is her trademark. On a late game she can deal more than 1000 damage in a blow with her critical. That's just too much for some squishy hero like Crystal Maiden or Shadow Demon and those squishy heroes will just explode like a small cockroach. Usually, Mortred player buy Bkb and Battlefury to make her get a cleaving attack. And with cleaving attack and magic immunity, nothing can stop her.

PROS	CONS
Highest Critical Damage in DotA	Weak on early game
Have a skill to dodge attacks	Needs many items to reach the maximum potential
Can last hits from long range although she is a melee (Using one of her skill) and the manacost is low
Low attack speed on early-mid game

ROLE

Melee - Carry - Escape

STATS

LEVEL	1	15	25
HIT POINTS	530	1,022	1,754	SIGHT RANGE	1800 / 800
MANA	169	351	741	ATTACK RANGE	128
DAMAGE	46-48	90-92	142-144	MISSILE SPEED	N/A
ARMOR	4	10	`18

ABILITIES
1. Stifling Dagger

Deals minor pure damage and slows the enemy unit's movement speed. Deals half damage to heroes.

MANA COST: 30/25/20/15	COOLDOWN: 8
ABILITY: UNIT TARGET	AFFECTS: ENEMY UNITS
DAMAGE: PURE	DAMAGE: 50 / 100 / 150 / 200
SLOW: 50%	DURATION: 1 / 2 / 3 / 4

The first skill learned by the Sisters of the Veil often signals an incoming hit.
A single target, slowing skill that deals some damage. On early game, this skill is useful for last hitting the creep that too far to be attacked. With the low mana cost, this skill become spammable so you can use this skill last hits every time you need it.
This skill can also be used on a hero. This will make the targetted hero to be slowed and cannot run away from you so you can easily harass him. Don't try to be over-aggressive on early game, it is recommended to use this only for creeps for early game, and then if you need to gank on mid-late game you can use this on a hero.

2. Phantom Strike

Teleports to a unit, friendly or enemy, and grants bonus attack speed while attacking if it's an enemy unit.

MANA COST: 50/50/50/50	COOLDOWN: 14/11/8/5
ABILITY: UNIT TARGET	BONUS ATTACK SPEED: 100% / 100% / 100% / 100%
MAX ATTACKS: 4

Mortred's silken veil is the last thing her unfortunate target sees.
Jump into a unit, you can jump into foe to attack him or you can jump into ally to escape from enemies.
You get increased attack speed after you jump, a good speed booster for a carry that need lots of attack speed like you.
With a good attack speed, it will trigger more critical attack to demolish the enemy.

3. Blur

The Phantom Assassin becomes hard to see by blurring her body and disappearing from the enemy minimap when near enemy heroes. Some enemy attacks miss.

ABILITY: PASSIVE	EVASION: 20% / 25% / 30% / 35%
RADIUS: 1600 / 1600 / 1600 / 1600

Meditation allows a Veiled Sister to carefully anticipate her opponents in combat.
Gives you additional evasion to help you evade physical attacks from enemy. This is a very good defense against enemy's carry that will protects you from death.

4. Coup de Grace

Phantom Assassin refines her combat abilities, gaining a chance of delivering a devastating critical strike to enemy units.

ABILITY: PASSIVE	CRITICAL DAMAGE: 250% / 350% / 450%
CRITICAL CHANCE: 15% / 15% / 15%

A divine strike, Mortred honors her opponent by choosing them for death.
The best critical attack in DotA. 450% damage on level 3 is no joke for anybody. With a decent damage on late game, this skill will provide you with 1000++ attack on late game. So if you can land some attack to the enemy, it is almost 100% that your team will win the game.

SKILLBUILD

Level 1: Phantom Strike
Level 2: Stifling Dagger
Level 3: Stifling Dagger
Level 4: Phantom Strike
Level 5: Stifling Dagger
Level 6: Coup de Grace
Level 7: Stifling Dagger
Level 8: Phantom Strike
Level 9 : Phantom Strike
Level 10: Blur
Level 11: Coup de Grace
Level 12: Blur
Level 13: Blur
Level 14: Blur
Level 15: Stats
Level 16: Coup de Grace
Level 17-25: Stats

Why take Phantom Strike for level 1? You need Phantom Strike to escape if enemy wants to get firstblood by killing you. By jumping into nearby ally or creep, you can escape from firstblood.

Why maxed Stifling Dagger first? You need to increase this skill on early game for lower mana and more damage to last hit the creep. More level of this skill also makes you can harass more for enemy hero, with  more damage and more slow. Nuke is more effective on early game because enemy Hp is still low ( a few hundreds).

Why maxed Phantom Strike before Blur? Maxed Phantom Strike first gives many advantages because of the lower cooldown of this jumping skill. With lower cooldown you can catch your target by jumping and attacking him with more attack speed for every 5 seconds. You can also easier to escape if you are being chased.

STRATEGY
Early Game
On early game, you need to get as much farm as you can. The more creeps you can kill the better. Use Stifling Dagger to last hit the creep that too far to attack. As a carry, your main job is to farm because you need many items to be the best in the game. If you cannot succeed in farm, your team will have a hard time in the late game teamfight. Don't be too aggressive on early game, inexperienced Mortred player usually thinks that she is strong so he weirdly Phantom Strike and attack the stronger early-game hero which lead to a fool death.

Mid Game
You should still farm on this stage of the game. This is your only responsibility on early-mid game. You should get the best item you can get. You can change from lane to lane and get the farm you need. As a carry, farm is your main priority, if lane creeps is already empty, you should do the jungle creeps.
If there is a teamfight near your farming area, you should help your team win the teamfight. Use Stifling Dagger on a target and then jump and attack an enemy. With constant attack, you will trigger your Critical Strike that is your most deadly weapon.

Late Game
On this stage of the game, you should already have the items you need. Your farm on early-mid game should be paid off. Show your high Critical Damage to the enemy. If you can jump to the enemy and land some Critical Strike on this stage of the game, your team will be likely to win the teamfight. Your Critical blow are almost sure deals 1000++ damage. And usually you are already equipped with the Battlefury, that means a cleaving 1000++ damage should be received by the enemy. And no one can survive it.

ITEMBUILD
1. Quelling Blade
Cost: 225

Active: Destroy Tree - Destroy a target tree. Passive: Quell - Gives bonus attack damage against non-hero units, depending on the type of hero you are.   MELEE BONUS: 32%     RANGED BONUS: 12%      Cooldown: 5

Why Quelling Blade? Makes you easier to lasthit every creeps with its additional damage.

2. Poor Man's Shield
Cost: 550

Passive: Damage Block - Blocks physical attack damage, depending on the type of hero you are. Poor Man's Shield will always block attacks from enemy Heroes, but has a chance to block damage from creeps. MELEE BLOCK: 20     RANGED BLOCK: 10     BLOCK CHANCE: 60%     + 6 Agility

Why Man's Shield? Makes you easily lasthit every creeps and can defend yourself with the damage blocking ability.

3. Battlefury
Total Cost: 225
Recipe: Broadsword, Claymore, Preserverance

Passive: Cleave - Deals a percent of attack damage in a 225 AoE around the target. Does not work on ranged heroes. Cleave damage on non-primary targets is not reduced by armor values. + 65 Damage + 6 HP Regeneration     + 150% Mana Regeneration      CLEAVE DAMAGE: 35%

Why Battlefury? Makes you faster in farming creeps. Makes your gold flow faster. Your job is to farms, this item will really help.
And on the teamfight, it will splash your ultra high crits which is 100% annoys your opponent.

4. Power Threads
Total cost: 1400
Recipe: Gloves of Haste, Boots of Speed, Belt og Giant Strength/ Robe of Magi/ Band of Elvenskin

Active: Switch Attribute - Changes selected attribute between Strength, Agility and Intelligence. Flat movement speed bonuses from multiple pairs of boots do not stack. + 55 Movement Speed + 8 Selected Attribute   + 30 Attack Speed

Why Power Threads? It will gives you attack speed, that's what you need, attack speed and damages. Power threads is also a flexible shoes, you can change it to STR, AGI, or INT for what you need.
STR for Survivability, AGI for damage and attack speed, and INT for mana.
This will gives you an instant +152 HP if you change it from AGI/INT into STR, this is needed to survive in condition where your HP is so low while you are using AGI or INT Thread.
This will gives you an instant +104 mana if you change it from AGI/STR into INT Thread, this is needed to gain an instant mana in condition where your mana is so low while you need more mana to do the skill.

4. Black King Bar
Total cost:: 3900
Recipe: Ogre Axe, Mithril Hammer, Recipe

Active: Avatar - Grants magic immunity. Duration and cooldown decrease with each use. Some Ultimate abilities are able to disable through Black King Bar. + 10 Strength + 24 Damage     DURATION: 10/9/8/7/6/5     Cooldown: 80

Why Black King Bar? It gives you survivability in a teamfight because you will get magic immunity during teamfight.

5. Dominator > Satanic
Total Cost: 5850

Recipe: Tarrasque + Helm of the Dominator + Recipe 

Active: Unholy Rage - Increases Lifesteal by 175% for 3.5 seconds. Passive: Lifesteal - Gives Lifesteal on attacks. Satanic is a Unique Attack Modifier, and does not stack with other Unique Attack Modifier. + 20 Damage    + 25 Strength    + 5 Armor    LIFESTEAL: 25%   Cooldown: 35

Why Satanic? It will really helps you to survive in a hard condition in a teamfight. It will gives you lifesteal, Strength, and Armor, thats all what you need to survive in a teamfight. If your HP become low, immediately use the Unholy Rage, attack your enemy and your HP will full again in seconds.

6. Butterfly
Total cost:: 6000
Recipe: Talisman of Evasion, Eaglesong, Quarterstaff

+ 30 Agility            + 30 Damage + 35% Evasion      + 30 Attack Speed

Why Butterfly?
It gives you more damage and more attack speed that makes you become much more powerful. It also gives evasion to helps you survive in teamfight. Butterfly is always a good item for a carry.

7. Boots of Travel
Total cost: 2450
Recipe: Boots of Speed + Recipe

Active: Teleport - Teleports you to an allied non-hero unit or structure. Flat movement speed bonuses from multiple pairs of boots do not stack. + 100 Movement Speed Manacost: 75   Cooldown60

Why Boots of Travel? With the creeps becoming more powerful in pushing your base, you need fast teleport to save your Throne/Tree.
Also, this item will give you 1 free slot that before is used for Teleport Scroll if you don't have this Boots.

8. You can increase your DPS more. Choose your own DPS items.As a carry, damage is your priority.

	Mjolnir	MKB	ABYSSAL	DIVINE RAPIER
DAMAGE	24	88	100	300
ABILITY	Chain Lightning	100% HITS	STUN	NONE
CHANCE	25% DAMAGE: 160	MINIBASH 35% DAMAGE: 100	MELEE: 25 % RANGE: 10%	NONE
OTHER	+ 80 Attack Speed	+15 ATK SPEED	+10 STRENGTH 2 SEC STUN	NONE

Mjolnir: Gives you a massive attack speed and also gives a Chain Lightning that can easily triggered (it have 160 damage and damaging all enemies in the area). The additional attack speed makes you get more crit chance from your ultimate.
MKB: 100% HITRATE will helps you to fight some evasion heroes like Mortred or Rikimaru.

ABYSSAL: A decent +100 damage and makes you become a Stunner

RAPIER: Be careful if you choose to hold this. 1 hit kill is a sure. 2-3 hits is the worst. Need protection from your support. Must come if the situation is clear safe for you to come inside the teamfight. Need some disabler friends.

GOOD ALLIES

1. Supportive Heroes
(Example: Shadow Shaman, Crystal Maiden, Vengeful Spirit)

Supportive heroes have disables and nice skill to helps carries and makes a teamfight easier for the team.

Shadow shaman: Have hex, shackles, and wards to helps you disables enemy

Crystal Maiden: Have 1 lockdown, 1 slower, and have +mana regeneration

Vengeful Spirit: Have stun, swap, and +damage aura

2. Initiator Hero

(Example: Tidehunter, Earthshaker, Treant)

They have initiating skill that will make your way into the teamfight. After they use their skill, you can jump into the enemy and kill them all!

ANNOYING ENEMY

1. Early Game Harasser - Mid Game Ganker

(Example: Venomancer, Shadow Shaman, Balanar)

 If they suceeded in obstruct your farm, you will have a hard time on mid-late game because your item will be suck.

Dota 2 - Venomancer Build Guide

BIO
In the Acid Jungles of Jidi Isle, poison runs in the veins and bubbles in the guts of every creature that scuttles, climbs or swoops between fluorescent vines dripping with caustic sap. Yet even in this toxic menagerie, Venomancer is acknowledged as the most venomous. Ages ago, an Herbalist named Lesale crossed the Bay of Fradj by coracle, searching for potent essences that might be extracted from bark and root, and found instead a nightmare transformation. Two leagues into Jidi's jungle, Lesale encountered a reptile camouflaged as an epiphyte, which stung him as he mistakenly plucked it. In desperation, he used his partial knowledge of the jungle's herbal bounty, mixing the venom of the (swiftly throttled) reptile with the nectar of an armored orchid, to compound an antidote. In the moments before a black paralysis claimed him completely, he injected himself by orchid-thorn, and instantly fell into a coma. Seventeen years later, something stirred in the spot where he had fallen, throwing off the years' accumulation of humus: Venomancer. Lesale the Herbalist no longer-but Lesale the Deathbringer. His mind was all but erased, and his flesh had been consumed and replaced by a new type of matter-one fusing the venom of the reptile with the poisonous integument of the orchid. Jidi's Acid Jungles knew a new master, one before whom even the most vicious predators soon learned to bow or burrow for their lives. The lurid isle proved too confining, and some human hunger deep in the heart of the Venomancer drove Lesale out in search of new poisons-and new deaths to bring.

INTRODUCTION
Venomancer is Poison. He is a hero that uses poison in many ways. His normal attack is a poison. He have a slower-ganking skill taht is a poison. And his ultimate: is the strongest poison in DotA, if the enemies doesn't have a -spell damage. This skill will reduece this HP to almost death, but unfortunately, this skill cannot kills enemies, it jusr leave the enemy with 1 HP.  And his other skill, is summoning a small ward, but can't summon many wards and it will become strong because of it's large number. Usually, people pick this hero to become a support-warder because he doesn't need lots of farm to become strong. Venomancer, the most deadly poison caster in DotA.

PROS	CONS
His ultimate deals tons of AoE damage.	Squishy
A decent slower	His ultimate cannot kill the enemies
His wards is strong for pushing or counter pushing. Many wards also lead to auto last-hits	Doesn't have an escaping skill
Doesn't need lots of farms.
Very good on early-mid game harassing ability. Easy firstblood for you.
Wards give vision to the fog.

ROLE

Ranged - Support - Nuker - Initiator - Pusher

STATS

LEVEL	1	15	25
HIT POINTS	492	984	1,716	SIGHT RANGE	1800 / 800
MANA	195	514	1,001	ATTACK RANGE	450
DAMAGE	46-48	82-84	126-130	MISSILE SPEED	900
ARMOR	3	8	15

ABILITIES
1. Venomous Gale

Launches a ball of venom in a line, poisoning enemy units so that they take both initial damage and damage over time, as well as suffering slowed movement. Venomous Gale deals damage every 3 seconds over its duration.

MANA COST: 125	COOLDOWN: 22
ABILITY: POINT TARGET	DAMAGE: MAGICAL
DURATION: 15 / 15 / 15 / 15	STRIKE DAMAGE: 25 / 50 / 75 / 100
DAMAGE OVER TIME: 15 / 30 / 45 / 60	SLOW: 50% / 50% / 50% / 50%

A concoction of various stings, poisons, and toxins gathered from the jungles of Jidi Isle, victims surviving it are rare.
This is your main skill for slowing and harassing your enemy on early-mid game. 50% slow is the best early game lvl.1 slow on this game. With this skill, stealing firstblood is quite easy for your team, all you need to do is casting this skill on a target and harass him until he death. He cannot run because the slow movement speed is sjust too much for a hero to handle.
Not just the best slow on early game, this skill also does a decent damage for early game harassment. So, firstblood hunter is your job because of this skill.
You become a strong laner because of this skill, because if the enemy is struck with this skill, he should run or he will feel your harassment.

2. Poison Sting

Adds poison damage to Venomancer's normal attacks, slowing movement speed.

ABILITY: PASSIVE	DAMAGE: MAGICAL
DURATION: 6 / 7 / 8 / 9	DAMAGE OVER TIME: 5 / 10 / 15 / 204
SLOW: 11% / 12% / 13% / 14%

The paralytic sting of the creature which caused his transformation now belongs to the Venomancer.
This is one of your harassing skill, with this buff, your normal attack will contain poison that will deal damage per second and slowing the target.
You become one of the best harasser with this skill. Your attack become full of poison. Your enemy can't last hits properly because they will always harassed by your attack.

3. Plague Ward

Summons a plague ward to attack enemy units and structures. The ward is immune to magic.

MANA COST: 20/20/20/20	COOLDOWN: 5
ABILITY: POINT TARGET	DAMAGE: PHYSICAL
DURATION: 40 / 40 / 40 / 40	WARD HP: 75 / 200 / 325 / 450
WARD DAMAGE: 10 / 19 / 29 / 38

A mixture of his old herbalist talents and newfound toxic mastery creates a living embodiment of plague.
Summon ward that will attack the enemy. You can call 1 ward every 5 seconds. You must accumulate the wards to become useful. You need to call many wards to deal lots of damage to your opponent.
This ward is very effective for pushing or counter-pushing. Tower will be destroyed quickly using this ward. Creeps wave will be destroyed quickly using this ward.

4. Poison Nova

A spreading ring of poison that does damage over time to enemy units around Venomancer. Poison Nova's effect cannot bring units below 1 HP. Upgradable by Aghanim's Scepter.

MANA COST: 200/300/400	COOLDOWN: 140/120/100
ABILITY: NO TARGET	DAMAGE: MAGICAL
RADIUS: 830 / 830 / 830	DURATION: 12 / 14 / 15
DAMAGE: 36 / 58 / 81	SCEPTER COOLDOWN: 140 / 120 / 60
SCEPTER DURATION: 14 / 15 / 16	SCEPTER DAMAGE: 58 / 81 / 108

In the Acid Jungles, creatures releasing noxious poison to their attackers is common; Venomancer spreads this plague beyond the Jidi Isle.
This is one of the scariest AoE skill in DotA. Every hero that struck with this skill, will receive lots of damage per second until their Hp becomes very low. But unfortunately, this skill cannot kill a hero, this skill will leave the hero with 1 HP and will stop dealing damages. The damage is so high so everyone should run after get exposed by the poison except they have magic immunity or have Pipe's shield, or high magic resist.
You can gank with just 2-3 heroes and win against 5 heroes if this skill can deal maximum damage to all enemy.

SKILLBUILD

1. Full Harassing - Ganking Build
This build is focused on Venomous Gale and Poison Sting to harass enemies on early-mid game. With these 2 skills maxed on early game, you will get the maximum harassing potential to control the lane so your enemy cannot farm in your lane.
Level 1: Venomous Gale
Level 2: Poison Sting
Level 3: Venomous Gale
Level 4: Poison Sting
Level 5: Venomous Gale
Level 6: Poison Nova
Level 7: Venomous Gale
Level 8: Poison Sting
Level 9 : Poison Sting
Level 10: Plague Ward
Level 11: Poison Nova
Level 12: Plague Ward
Level 13: Plague Ward
Level 14: Plague Ward
Level 15: Stats
Level 16: Poison Nova
Level 17-25: Stats

Why take Venomous Gale for level 1? Venomous Gale is the best slowing skill on level 1. You will need this to slows the enemy to get the firstblood or at least harass them.
Or to escape if enemy wants to get firstblood by killing you, you should slowing them so they can't attack you.

Why maxed Venomous Gale first?  This is your main nuke, you will need this for ganking, farming, and killing or early mid-game.

Why maxed Poison Sting before Plague Ward? Because this is a full harassing build, you need Poison Sting better than Plague Ward because the poison from your attack is essential to give poison while you attacks the enemy. So max Poison Sting before Plague Ward for maximum harassment.

1. Pusher-CounterPush Build
This build is focuses on Plague Ward for pushing or counter-pushing.
Level 1: Venomous Gale
Level 2: Plague Ward
Level 3: Plague Ward
Level 4: Venomous Gale / Poison Sting
Level 5: Plague Ward
Level 6: Poison Nova 
Level 7: Plague Ward
Level 8: Poison Sting / Venomous Gale
Level 9 :  Venomous Gale
Level 10: Venomous Gale
Level 11: Poison Nova
Level 12: Poison Sting
Level 13: Poison Sting
Level 14: Poison Sting
Level 15: Stats
Level 16: Poison Nova
Level 17-25: Stats

Why take Venomous Gale for level 1? Venomous Gale is the best slowing skill on level 1. You will need this to slows the enemy to get the firstblood or at least harass them.
Or to escape if enemy wants to get firstblood by killing you, you should slowing them so they can't attack you.

Why maxed Plague Ward first?  Because of this is a push-counter_push build, you need the pushing power from your wards. Massive wards deal massive damage to creep waves and tower. You can destroy tower quickly with the wards.

Why maxed Venomous Gale before Poison Sting? The rule of DotA: Nukes for early game, physical damage for late game.  Venomous Gale is a nuke that will  deal more damage on early-mid game. And Poison Sting is for physical attacks that will be the main source of damages for mid-late game.

STRATEGY
Early Game
Venomancer have the best slower in this game on level 1. You need to use this advantage into maximum potential.
Since the game start, be aggressive by hunting firstblood and harass your enemy to the max. While your enemy is knocked with your 50% move-slow, you and your friends can easily harass the target and get firstblood.

1. If you choose the push-counterpush build, you need to max the Wards first. Ward is not so powerful if alone, so you need to stack the wards until it will surround the area and become the strong tools to deal damage to the area.
Pushing towers will be easy with your wards. And also don't forget about the defensive power of your wards, it can make your enemy to retreat and cancel their push.

2. If you choose the full-harassing build, your enemy will be so annoyed of you. They will have a hard time in last hitting/denying because you will always can harass them until low HP, or get kills if you're lucky.

You can last hits the creeps but this is not your priority because you don't need much farm to be strong, your skill alone is enough to fight your enemy.

Usually your team decide you to be the support for the team, so you may need to buy some wards, courier, or Smoke for the team.

Mid Game
Mid game is the time for ganking-party and early-pushing. Usually, the ganker from each team will roam around the map try to help other lane and get early kills. Ganker like Lion or you are the horoes who should do this job. What you need to to is finding easy lane with a delicious enemy to start with. Coordinate the gank with your partner and make sure your team gets the early kills you need. Your main skill is Venomous Gale, if this skill successfully hit the target, your team can easily harass and get kills. So first you need to master the using of this skill. This skill is a stright forward skill and not a targetted skill, so your opponent can move and evade this poison. What you need to do is to come nearer your opponent and make sure it will hits your target. Once it hits the target, your move will be easy. You and your friends can then harass your target easily.

Here on mid game, you should already have Poison Nova. This is your main skill. This is one of the biggest skill damage on this game. The damage is almost sure will reduce enemy's HP to a very low condition. But unfortunately, this skill cannot kill your target, it will leave the enemy with just 1 HP and will stop reducing HP. You will need another source of damage to get the kills, you can use your own skill like Venomous Gale or your friends can do the job.

If you choose to be the pusher-counterpusher build, then you need to maxing Plague Ward first. Stacking Plague is the best way to defend against enemy's push. The damage from accumulated Plagues in an area can destroy enemy's creep waves easily.The Plague is also needed for pushing, stacks the Plague near enemy's tower and deal continuous damage to tower and the creeps.

If you are the support of your team, remember to always buy the wards and place it in a strategiuc location to see enemy's movement.

Late Game
On late game, your job is still the same:
1. If you are the support for the team, remember to buy wards, smoke, or gem for the sake of the team.
2. Plague Ward stacking is the best way to defend against enemy's push.
3. Plague Ward stacking is also useful for pushing. It will destroy enemy's creep waves and towers.
4. Posion Nova have very high damage, you need a good positioning for this skill, try to at least use it for 3 heroes.
5. Always use Venomous Gale and Normal Attack to harass enemy's more.

That is 5 big things to remember. Try to do your job as good as you can. Venomancer job is to support the team by buying the teams supplies like Observer Wards, deal as much poison damage to enemies and to place lots of Plague Wards to push or counterpush.

ITEM BUILD
1. You need to buy courier and wards for the team. If someone already done it, you don't need to.
Courier: 150
Wards: 150

Courier: Transfer items from shop to heroes Wards: Scouting some important area to protect teams against some ganks.

You are the kind of hero that doesn't need lots of farm, so you will have golds to buy this kind of shit items. Your team will rely on courier and wards to become good. Courier will faster item transportation, and wards is needed to avoid enemy's gank.

2. Arcane Boots
Total cost: 1450
Recipe: Boots of Speed + Energy Booster

Active: Replenish Mana - Restores mana in an area around the hero. Flat movement speed bonuses from multiple pairs of boots do not stack. + 60 Movement Speed + 250 Mana MANA RESTORED: 135 Mana Needed: 25    Cooldown: 55

Why Arcane Boots? You have spammable skills, so you need more mana, with this item, your mana will be fulfilled. And also to replenish mana of the team.

3. Drum of Endurance
Total Cost: 1725
Recipe: Bracer + Robe of Magi + Recipe

Active: Endurance - Gives bonus +10 attack and +10% movement speed to surrounding allies. Passive: Swiftness Aura - Gives bonus attack and movement speed to surrounding allies. Multiple instances of Swiftness Aura do not stack. + 9 All Attributes + 3 Damage    AURA ATTACK SPEED: 5    AURA MOVE SPEED: 5% Cooldown: 30

Why Drums? It will gives you survivability with + STR and gives your team  +Attack speed and +Movement Speed that will benefit your whole team.

4. Black King Bar
Total cost:: 3900
Recipe: Ogre Axe, Mithril Hammer, Recipe

Active: Avatar - Grants magic immunity. Duration and cooldown decrease with each use. Some Ultimate abilities are able to disable through Black King Bar. + 10 Strength + 24 Damage     DURATION: 10/9/8/7/6/5     Cooldown: 80

Why Black King Bar? It will makes you can channel Poison Nova without getting interrupted. It  also gives you survivability in a teamfight because you will get magic immunity during teamfight.

5.  Schyte of Vyse
Total cost: 5675
Recipe: Mystic Staff + Ultimate Orb + Void Stone

Active: Hex - Turns a target unit into a harmless critter for 3.5 seconds. Destroys illusions. + 10 Strength   + 10 Agility  + 35 Intelligence + 150% Mana Regeneration Manacost: 100   Cooldown: 35

Why Schyte of Vyse? Very good item to initiate a teamfight. You are considered a support, and this item is one of the best supportive items you can get. Or  you can use this to defend against somebody by making him a chicken.

6. Aghanim Scepter

Passive: Ultimate Upgrade - Upgrades the ultimates of certain heroes. + 10 All Attributes   + 200 Health   + 150 Mana

Why Aghanim's Scepter? Increase damages from your ultimate. Nice item to win a teamfight. And this item also gives you more survivability because of its + HP.

If you need a better initiation you can buy

7. Blink Dagger
Cost: 2150

Active: Blink - Teleport to a target point up to 1200 units away. If damage is taken from an enemy hero, Blink Dagger cannot be used for 3 seconds. Manacost: 75   Cooldown: 14

Blink Dagger is a perfect item for initiating purpose.

GOOD ALLIES

1. Ancient Apparition

This hero is a very good partner for you because of his ultimate which is can be comboed with your ultimate Poison Nova.

His ultimate kill enemies in low HP. Poison Nova will never kill enemy if not accompanied by another skill/damage. And it will be very disappointing if there is an escaped enemy in 1 HP. And Ancient Apparition's ultimate Ice Blast will do the job, it will shatter all enemies in low HP.

2. Carries
(Example: Magine, Void, Luna)

Carries should come after you initiate a teamfight, and they should the right click and use all their skills to the enemies.

3. Strong Ganker that can 2-3 vs 5 gank.
(Example: Invoker, SandKing)

You have the strongest poison in the game, Which will deal tons of damage to the AoE. And more AoE will completely bomb your opponents.

4. Low HP Killer
(Example: Zeus, Spectre, Bloodseeker)

If Someone somehow managed to escape with 1 HP, they can execute him.

BAD ENEMIES
1. High Instant Damage
(Example: Lina, Lion, Tiny)

They are all have deathly instant damage. And because you are squishy, you can instantly die, beware of them.

2 Pipe of Insight

You have deadly posion, but this item will counter it so your damage will be not as powerful as it should.

3. Blademail

Ruptured target move? you can feel the damage too.