The merest nick of your knife can end the life of most creatures. You have honed the craft of fashioning poisons to a terrifying degree, granting you the following benefits:

• When you make a damage roll against a creature with immunity to poison damage, treat the creature as though it only had resistance to poison damage.
• You can apply poison to a weapon or piece of ammunition as an object interaction, instead of a bonus action.
• You gain expertise in the use of a Poisoner's Kit, which means your proficiency bonus is doubled for any ability check you make with it. This bonus does not apply if you benefit from another feature which would double your proficiency bonus, such as Expertise.
• With one hour of work using a poisoner's kit and expending 500 gp worth of materials, you can create a number of doses of a potent poison equal to half your proficiency bonus, rounded down. Once applied to a weapon or piece of ammunition, the poison retains its potency for 1 minute or until you hit with the weapon or ammunition. When a creature takes damage from the coated weapon or ammunition, that creature must succeed on a Constitution saving throw equal to 12 + your proficiency bonus or take poison damage equal to 1d8 x your proficiency bonus and become poisoned until the end of your next turn. The saving throw DC and damage are set when you create the poison.