Ice biome



The Underground Snow biome is the underground version of the Snow biome, beginning at the Cavern layer, and stopping at the lava layer. In the Mobile version the snow biome is much smaller in size than the ones on PC/Console version of Terraria. It is composed mainly of Snow Blocks and Ice Blocks. Thin Ice is generated over water and breaks when a character falls over 4 tiles onto it (unless using the Ice Skates or another accessory crafted from them). Underground Snow is the only place where Ice Chests can be found.

During Hardmode, the corruption/crimson/hallow can spread through it, generating purple/red/pink ice, respectively. They are unable to spread through snow blocks. In the mobile version of Terraria, the Armored Viking, Snow Flinx, Icy Merman, Ice Tortoise and Ice Mimic spawn much rarely than the ones on PC/Console version. Moreover the Ice chests are uncommon but are obtainable in the mobile version, sometimes the Ice chest may not be found at all in certain Underground Snow Biomes.

History
Toundra Souterraine