Slasher

Slasher
Feat
Prerequisite: Level 4

You gain the following benefits.
Hamstring.
Once per turn when you hit a creature with an attack that deals Slashing damage, you can reduce the Speed of that creature by 10 feet until the start of your next turn.
Enhanced Critical.
When you score a Critical Hit that deals Slashing damage to a creature, it has Disadvantage on attack rolls until the start of your next turn.

Source: Player's Handbook (2024) (XPHB), page 208