Changes from Mutant Creatures

• Immune to each other's damage
• Only retaliate against hostile mobs
• Cannot harm non-hostile mobs with their ice blocks
• Take damage when in rain, and will try to find a place to hide from the rain
• Heal slowly when it's snowing
• Can only spread snow in biomes with a temperature less then 0.95
• Do not drop a Jack O' Lantern when killed, as they can be sheared like a normal Snow Golem to drop it