The Ice Guardian was a giant monster that defended Urgon's piece of the Infernal Machine in the inner sanctum of Shambala Sanctuary. The ice guardian was a larger, four-legged version of the smaller, bipedal ice creatures that attacked Indiana Jones throughout the Sanctuary.
The ice monster was capable of standing on its hind legs, climbing up walls and ceilings, and spitting out sharp icicles at intruders. It was also capable of attacks at close range but is most notorious for rolling into a destructive ball that could crush anyone in its path.
The adventurer retrieved Urgon's part of the Infernal Machine from Urgon's study and used the device's concussive power to injure the monster, smashing its icy body full of cracks. The third time Jones activated the device, the ice guardian exploded into countless tiny pieces.