Sadistic

You become satisfied with hurting others

• Whenever you damage a creature with a weapon, you gain Temporary Hit Points equal to its challenge rating for 1 minute. This effect can occur only once on your round.
• Whenever you kill a creature with a weapon, you gain Temporary Hit Points equal to its challenge rating that last for 1 hour.
• Other creatures recognize you as a being an agent of chaos. You have disadvantage on Persuasion checks made to calm others.
• You have nightmares of the horrid things you've done. When you finish a long rest, make a DC 15 Wisdom saving throw. On failure, you have disadvantage on your first attack roll made against a creature until you finish another long rest. On a save, nothing happens.