Optional Feat: Poison Master

Prerequisite: Intelligence score of 14 or higher; proficiency with alchemist’s supplies or poisoner’s kit
Through careful study of poisons, you have mastered the art of crafting and using them, providing you the following benefits:

• When you are crafting a poison, you make 1d4 + your Proficiency Bonus doses rather than just one without having to expend additional resources.

• When you are crafting a poison that has multiple potential routes of administration, you may choose the route of administration that results from the crafting.

• When you craft a poison that has multiple potential secondary effects, you may select which secondary effect is applied, rather than leaving it to chance.

• You may apply one dose of your crafted poisons to your weapon once per round without using an action. You may apply one additional dose of poison using a bonus action.

Source: DM Lair - Poisons Explored

Optional Feat: Poison Master