The Venom

Your patron could be a God, an otherworldly entity or a lesser deity who favours a more subtle way to carry out their will, wishes or orders. Poisoning or stealthy assassination are the most favoured way of killing an enemy. The more concealed a wish or an order carried out, the greater the reward this being grants. In the Forgotten Realms Zehir The Master of Poisons and Shadows is a proper being for this Patron.
(In our homebrew Realm, Continent of Postora, Yun'ohu The Serpent Lich is an equivalent being for this Patron)

Expanded Spell List

 

The Venom lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Venom Expanded Spells

SPELL LEVEL	SPELLS
1st	disguise self, detect poison and disease
2nd	alter self, pass without trace
3rd	nondetection, stinking cloud
4th	fabricate, greater invisibility
5th	contagion, mislead

Subtle as a Shadow

To ensure low attention drawn by your actions, your patron bestow upon you an extraordinary stealth and proficiency with weapons to enhance your execution. Starting at 1st level, you gain proficiency in Stealth and you can take a bonus action on each of your turns in combat to take the Hide action.

At 6th level, you can double your proficiency bonus when you make a Stealth check.

Subtle as a Shadow (Expertise)

At 6th level, you can double your proficiency bonus when you make a Stealth check.

Trained Venomer

At 1st level, you acquire the training necessary to execute assassination with the necessary tools. You gain proficiency with finesse weapons, blowgun and poisoner's kit.

As a bonus action, you also can touch one weapon or one piece of ammunition and imbue it with the venom flowing through your patron's blessing. The attack with this weapon deal an additional 1d6 poison damage to the target. Every four levels you gain in this class, the extra damage increases by 1d6.

You can use this feature a number of times equal your Charisma modifier. You regain all expended uses when you finish a long rest.

 

Venomous Strike

Starting at 6th level, you gain new way to execute your target as quick as possible. When you are hidden from an enemy, you can use your bonus action to teleport up to 60 ft. to an unoccupied space within 10ft. behind that enemy if you can see him/her. If you make a weapon attack this turn, the target has to make a Constitution saving throw against your warlock spell save DC. On a failed save, the target suffers an additional 3d6 poison damage and is poisoned until the end of your next turn. On a success, the target suffers half the damage and isn't poisoned.

The poison damage increases when you reach certain levels in this class, increasing to 5d6 at 11th level, and 8d6 at 16th level.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Enhanced Metabolism

Beginning at 10th level, your patron acknowledges you as worthy and bestow upon you the required metabolism to use poison to its limit. You are immune to being poisoned and you gain resistance to poison damage. Additionally your blood can act as an antidote to poisons. As an action you can inject your blood to a creature and end the poisoned condition affecting it.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Serpentine Escape

Starting at 14th level, your patron gives you one hidden card to defy death. If you take damage that reduces you to 0 hit points and doesn’t kill you outright, you can use your reaction to turn your body into swarm of poisonous snakes, the statistics for which are in the Monster Manual. You can add your proficiency bonus to your AC and to saving throws you were proficient with as a humanoid and you gain temporary HP equals your warlock level. You can take actions as a swarm of poisonous snakes and you turn back into your humanoid form if your hp becomes 0, you are incapacitated or you take a bonus action to revert back. You revert back to your humanoid form with 1 HP.

Once you use this feature, you can’t use it again until you finish a long rest.