Side view of a Mushroom Spider Cave, with a few Mushroom Spiders inside.
Mushroom Spider Caves are are dome-like structures generating in Mysterium that are made of fungal rock. Inside is a single spawner that spawns Mushroom Spiders. Players should avoid these structures until they reach Hunter level 29, as they cannot damage Mushroom Spiders below this level. Mushroom spiders give the player 21.6 Hunter XP when killed.