Staggering Smite

Player's Handbook (2024) p. 320

Level
4
School
Enchantment
Casting Time
Bonus Action, which you take immediately after hitting a creature with a Melee weapon or an Unarmed Strike
Range
Self
Components
V
Duration
Instantaneous
Classes
Paladin, Blood Hunter (Alt. LaserLlama) (Order of Witch Knights), Warlock (Hexblade), Warlock (Hexblade Patron (UA)), Warlock (Hexblade Patron v2 (UA)), Warlock (Sorcerer-king Patron (UA))

Description

The target takes an extra 4d6 Psychic damage from the attack, and the target must succeed on a Wisdom saving throw or have the Stunned condition until the end of your next turn.

Using a Higher-Level Spell Slot: The extra damage increases by 1d6 for each spell slot level above 4.