Binding Smite

Your strike summons holy chains from the ground to strike and imprison your ememy, and the target takes an extra 4d8 Force damage from the attack. Additionally, if the target is a creature, it must succeed on a Dexterity saving throw or has the restrained condition until the end of your next turn.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 4.