You relish in the cold that comes from the eviction of life.

Cast when a living creature is reduced to 0 hit points within 15 feet of you. The creature must make a wisdom save or else it dies. If it fails, you get 1d4 temporary hit points when the creature dies. If it succeeds, the creature dies and explodes, dealing 1d4 cold damage to any creature within 5 feet of it. 

At Higher Levels. The number of temporary hit points and damage done by the creature increases by a die at 5th level (2d4), 11th level (3d4), and 17th level (4d4).