Sunburst Execution

When you score a critical hit or reduce a creature to 0 hit points with an unarmed strike or monk weapon, a pulse of radiant light explodes from the target. Each hostile creature within 10 feet of the target must make a Dexterity saving throw against your Monk Ki/Focus save DC. A creature takes 2d6 radiant damage on a failed save, or half as much damage on a successful one.

Additionally, you gain temporary hit points equal to your Monk level + your Wisdom modifier.