Black Scorpion

You mastered the skill of undetectable killing through the means of the advantageous unseen attacks and the implementation of poisons. Your body and mind have been honed into the fine point of a weapon capable of dealing the most lethal of blows to any foe.

Expert Poisoner

When you choose this archetype at 3rd level you gain proficiency with the poisoners kit. When you craft a poison using your poisoners kit you can do so at half the cost and taking half the time.

You can use your Cunning Action to apply a poison to a weapon or have it interact with an object.

Syndicate Weapon

A Black Scorpion is put through rigorous amounts of training with a variety of weapons, until they are able to strike vital spots even with weapons not designed to do so. Upon reaching 3rd level, you may select a type of weapon (example: Longsword, Glaive, etc.) and designate it as your Syndicate Weapon; You become proficient with this weapon.

• Your Syndicate Weapon qualifies as a weapon for your Sneak Attack feature, even if the weapon is not a light, ranged or finesse weapon.
• If you inflict Sneak Attack damage with your Syndicate Weapon while it is coated with a poison, the target makes the save against the poison at disadvantage.
• You have advantage while attacking with your Syndicate Weapon against a target that has the poisoned condition.

Through your training you can specialize in a different Syndicate Weapon if you choose to. By going through additional rigorous training with this new weapon for 4 hours a day over a 7 day period, you can modify your techniques to this new weapon type. You can have a number of Syndicate weapons equal to your (int. modifier +1 minimum 1) 

Back Stab

At 9th level, whenever you have advantage on an attack and the attack hits you can have the target make a Constitution saving throw with a DC equal to (8 + proficiency + Dex modifier). On a failed save the attack is considered a Critical.

You can use this feature a number of times per long rest equal to your Int. modifier. 

Potent Poison

At 13th level, all poisons crafted and applied by you have their save DC increased by 2.

Furthermore, through your experiences and trials with poisons you've adapted and become more resistant. You gain advantage on saves against poison and have resistance to poison damage, also you are immune to the poisoned condition.

The Perfect Poison

At 17th level, you gain access to a poison that can bypass creatures natural resistances and immunities by attacking the very bonds of their life force.

When you deal damage with a poison you crafted, it has the following properties:

• Creatures immune to poison damage become effected by poison as if they were resistant instead.
• Creatures resistant to poison damage become effected by poison as if they did not have resistance.
• Creatures who have neither immunity or resistance to poison become effected by poison as if they are vulnerable to it.
• Creatures immune to the poisoned condition cannot benefit from from that trait.

You are immune to poison damage.