Creeping Cold

Reaching out your hand and making a crushing motion,
you turn the subject's sweat to ice, creating blisters as the ice
forms on and inside the skin.
The subject takes 1d6 cumulative points of cold damage
per round at the start of it's turn (that is, 1d6 on the 1st
round, 2d6 on the second, and 3d6 on the third). Only one
constitution save is allowed against the spell; if successful it
halves the damage each round.