Cremate

You utter a divine word, radiant flames erupt from a creature you see within range. The target must succeed on a Constitution saving throw or take 1d8 radiant damage. If the target is missing any of its hit points, it instead takes 1d12 radiant damage. 

When you target a corpse with this spell, over the next minute, the corpse rapidly burns and extinguishes itself leaving a pile of ash. 

The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).