Poison Expert

You gain proficiency with the poisoner's kit.

It takes you half the time needed to create poisons.

Any poisons you create that deal damage deal an additional 1d4 poison damage.

You have advantage on checks used to determine ingredients that can be used to create poisons and on checks to determine what kind of poison is effecting a creature.

You also know where you can find merchants that sell or buy poisons and poison ingredients. 

You are immune to poison damage and cannot be poisoned.