Trigger: You are attacking your Duel Target. Cost: 1 action

Make a melee attack. If the attack hits, the target must make a wisdom saving throw against your class DC. On a failed save, your target cannot move more than half its movement speed away from you and it must make its next attack against you until the start of your next turn.

revision1 Fighter FighterFeat Level2Feat

Note

Might just make it so they gain the slowed condition.