Caves+: The Frozen Caves

Under cold terrain, the mod generates a cave biome whose floor is mostly Frosted Stone with Cave Ice, and whose ceilings hang with Icicles. Zombies, Creepers and Skeletons spawn here in smaller groups than in most biomes, while Spiders spawn as usual. Creepers are the main threat, since their explosions can knock Icicles from the ceiling, and each Icicle deals 4 damage to a mob it strikes.

The biome yields Permafrost Gems, an uncommon ore, and rare Emeralds. Permafrost Ingots are crafted from the gems and used to make Freeze blocks, which freeze entities standing on them when given a Redstone signal. The rarer Frozen Caves structure is a large labyrinth of chests and Stray spawners, with a main room holding a Permafrost Safe that opens with a Permafrost Key. The safe contains an Armor Trim and a Music Disc, and an explorer map to the structure can be found inside Igloos.

The Endonova boss spawns in Cold Dungeons and is the likely source of the cave's loot. It casts Slowness spells and summons Strays to help in battle. When its health drops to about half, it enters a second phase in which it regenerates. Defeating it drops a set of items.