Weapon Specialist (5e Feat)
From D&D Wiki
Prerequisites: Proficiency with martial weapons
When you critically strike with a weapon you can forgo the additional damage and instead apply one of the following effects
-You can make an additional attack as a bonus action against another target within the range of your weapon.
-You can reduce the creatures speed to 0 until the start of your next turn.
-You can knock a large or smaller creature prone.
-You can push a large or smaller creature 10 feet away from you.