Nico’s Cave Expansion is a Minecraft add-on that adds new cave-related features to the game. These include new cave biomes, cave mobs, cave blocks, and cave-related items. The new cave biomes include underground forests, underground lakes, and underground rivers. The new cave mobs include cave-dwelling creatures such as bats, cave spiders, and cave beetles. The new cave blocks include stalactites, stalagmites, and underground crystals. And the new cave-related items include cave torches, cave lanterns, and cave maps. Overall, Nico’s Cave Expansion offers a new and exciting way to explore the underground world of Minecraft.