The Deep Shroom is a hazardous flora species found in abundance in the Blood Kelp Zones and their caves, in small clusters, and in the Lost River and the Sea Treader's Tunnel Caves. It is a relative of the Acid Mushroom. It is used as a raw material in the manufacturing of Hydrochloric Acid. The player can pick up Deep Shrooms by hand. The player can also strike one with a knife to destroy it and collect four Deep Shroom Spores, which causes 8 damage to the player and surrounding flora and fauna due to acid being released into the water.