This group of 3 boss enemies attack you at the end of the Onyx Mines. They are all incredibly powerful. Their attack consists of shooting 10 Thunder attacks that pierce terrain (but not characters). They also have a low AGI, meaning using Fire attacks on them is suicide. High-damage dealing Physical attacks is best for them. Their AT range is high, so you sometimes have to get lucky on the damage the attack deals. Also, despite being Mushrooms, they are NOT immune to Poison damage.