n large fungus mindless swarm 

Perception +10; no vision, tremorsense 60 feet

Skills Athletics +12, Stealth +13

Str +3 Dex +4 Con +5 Int -5 Wis +1 Cha -3

AC  20; Fort +14, Ref +13, Will +8

HP 65; Immunities fire, mental, precision, critical hits, visual; Weaknesses area damage 5, splash damage 5; Resistances piercing 5, slashing 5

Fire Healing Anytime a wizard sponge would take fire damage, it instead regains 1d8 Hit Points (regardless of the amount of damage the fire effect would have caused).

Speed 20 feet, climb 20 feet; suction

Swarming Slither [>] The wizard sponge slithers over each creature in its space, dealing 2d10 acid damage (DC 20 basic Reflex save). A creature that critically fails is sickened 1.

Suction Wizard sponges can climb on ceilings and other inverted surfaces.

Weak Acid Wizard sponge acid damages only organic material—not metal, stone, or other inorganic substances.

Bestiary 3, page 294.