The Great Intelligence Wishes You a Merry Christmas!

Intelligent Snow Snowman: Init +4; Atk bite +3 melee (1d5); AC 10; HD 2d6; MV 30’; Act 1d20; SP healed by cold, fire vulnerability, mind vulnerability, instant formation; SV Fort +6, Ref +0, Will +0; AL N.

Water molecules trapped in crystalline form, capable of reading minds, intelligent snow is a form of programable matter from some distant world or plane. Molded by the thoughts of Dr. Simeon - genius or madman - they became devouring monsters with shark-like teeth made of ice. 

A snowman created from intelligent snow is not only immune to cold damage, it is healed 1 hp for every die of damage such an attack would normally do. It takes twice normal damage from heat and fire. It has the power of instant formation, effectively using its Action Die to teleport from one location to another, usually attracted by thoughts or directed by some Great (and malevolent) Intelligence.

A PC facing an intelligent snow snowman can attempt to think it temporarily out of existence. To do this, the PC makes an opposed Will save against the snowman. If the snowman is being directly controlled by an Intelligence, the PC makes an opposed Will save against the controlling Intelligence instead. Success in either case prevents the snowman from reforming for 1d8 turns....although other snowman can use their instant formation ability to teleport to the same location.

It is even possible for PCs to attempt to wrest control over intelligent snow from whatever Great Intelligence currently controls it....but this would require an extended contest and is unlikely to succeed, especially if the controller has built up their dominance over years.

Without anyone to control it, intelligent snow eventually melts and becomes water. The water mixes with other water, dilutes, and becomes innocuous. A big enough reservoir of intelligent snow (or water), however, might become powerful enough that even a drop could dominate and transform a living creature, as happened on Mars in 2059.