Pain Taster (Rogue Subclass)

[Demon Tongue]

You focus your training on the gruesome art of punishment and torture. Those who adhere to this archetype are disturbed individuals. One can only become a pain tasters through intense torture, either by choice or not.

Whip Proficiency:
(Self explanatory)

Masochism:
Starting at 3rd level, you are at your deadliest when you hurt yourself. You have advantage on attack rolls for 1 round if you take 1d4 damage before the round starts.

Whip Mastery:
Starting at 9th level, you have become deathly effective with your whip. You roll 2d4 instead of 1d4 for each attack with a whip.

Torturer's Mettle:
Starting at 13th level, you've learned to harness power by the pain you receive. As a bonus action, you can receive the amount of temporary hit points as you have done damage to yourself. The amount resets after every use. This effect lasts for 1 hour. You can use this ability every short or long rest.

Sadism:
Starting at 17th level, when an attacker that you can see hits you with an attack, you can use your reaction to attack them.

Inspired by the Pain Taster Prestige Class from Pathfinder. Open to feedback.