The Ice Cave biome is a new biome spawned in a similar manner to the Glowing Mushroom and Heartstone biomes in that it will spawn in the Underground Layer, replacing tiles. The Ice Cave biome will allow the spawning of Ice Skeletons, which have a 50% chance to drop a Soul of Ice, required in crafting the Freeze Bolt. Ice Skeletons also have a 30% chance to drop an Ice Shard. The dimensions of each Ice Cave biome is roughly 70x70 tiles. Each Ice Block can be mined with the lowest pickaxe in the game.