Vital Striker (5e Feat)
From D&D Wiki
Prerequisites: Dexterity 13 or higher
You are trained to strike an enemy where it hurts, causing more than just an ordinary wound.
Before you make an attack with a weapon that you are proficient with, you can choose to take a -5 penalty to the attack roll. If the attack hits, add 1d6 to the attack's damage and impose one of the following effects of your choice on that target:
- Until the start of your next turn, the next attack roll against the target has advantage.
- The target has disadvantage on the next attack roll it makes before the end of its next turn.
- The target's speed is reduced by half until the end of it's next turn.