Upon casting frostform, the caster's body appears to transform into solid ice. His clothing and equipment remain unchanged. The caster gains the Cold subtype for the duration of the spell. He is immune to cold damage, but takes double damage due from fire unless the fire attack allows a saving throw for half damage, in which case he takes normal damage on a successful save and double damage on a failed save.
If the caster strikes an opponent with a natural or unarmed attack, the opponent takes 1d6+1 points of cold damage per caster level (to a maximum of 10d6 + 10). Anyone who touches the caster also suffers damage in this manner. Frostform also grants the caster a +10 competence bonus to Escape Artist checks due to the slippery nature of his icy skin.
Material component: A translucent gem worth at least 50 shillings.