Dying wish

To cast dying wish, you must be at 10 hit points or lower. 

when you cast dying wish, you can choose up to ten players around you, not including yourself, and give them one of these affects;

Regeneration. you regain all hit points.

Unnatural health. give the target 4d12 temporary hit points.

Immunity. choose one type of damage, and the target shall be immune to that type of damage until they use that type of damage in a spell or attack.

Barbarian build.  make the target's armor class 19.