Roguish Archetype (Poisoner)

Your study has made you an expert in the way of quick and untraceable deaths. Perhaps you learned out of a necessity to earn coin through the art of death; perhaps you had afamily member or spouse who required a quick dispatch. Whatever the case, poison has become your weapon of choice. You know where to find the deadliest plants, how to combine the right compounds, how to brew potions and coat your weapons. Assassin, murderer, opportunist - whatever they call you, you'll be sure to have the last laugh.

Master of Death

When you choose this archetype at 3rd level, you gain proficiency with the poisoner's kit and Dexterity (Sleight of Hand) checks. All rolls pertaining to the creation of poisons can be made with advantage.

Deadly Touch

At 3rd level, you can apply a poison to your current weapon with a bonus action: if desired, this can be done subtly with a successful Dexterity (Sleight of Hand) check. This poison remains on your weapon for either up to one hour, or until a creature is successfully injured by it. You can use any poison currently in your invetory, or a standard poison that you always keep to hand so long as it adheres to the following:

A creature subjected to this poison must pass a Constitution saving throw that is equal to 8 + your proficiency bonus + your class level. On a failed save, it takes 1d12 poison damage and is poisoned for 1 hour. On a successful save, the creature takes half damage and isn't poisoned. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Untouchable

Beginning at 9th level, you have experimented with so many poisons and antidotes that you now have immunity to poison damage.

Inevitable Demise

Starting at 13th level, your poisons are almost impossible to detect, and any creature attempting to do so makes their roll with disadvantage. Additionally, you have advantage on rolls that pertain to detecting poisons.

The End Comes To All

By 17th level, you've perfected the art of silent death. Your poisons can no longer be resisted by a saving throw. If the poison is applied through an injury and the attack roll is a crit, it applies maximum damage for that poison type.