Cauterize

You touch a creature that has taken damage since the end of your last turn, healing its freshest wounds. It regains 1d6 hit points. The hit points regained cannot exceed the amount of damage the target has taken since the end of your last turn. If the target is at 0 hit points, the spell fails.

At Higher Levels. The hit points this spell restores increases to 2d6 at 5th level, 3d6 at 11th level, and 4d6 at 17th level.