It is a creature of the Polypore dungeon. Level 95 Slayer is required to kill these. A player can not be assigned these as a task if they are below 60 Magic
The most effective way to kill these is to use Magic on them over an obstacle so that their fungal damage does not harm you. You can also grind your neem drupes into a jug to create neem oil and then sprinkle that on the Ganodermic beasts
to stun them and stop their fungal effect for a short period of time.
A hideous creature covered in ganodermic fungus.
Starved ancient effigy, Torstol seed, Magic seed (4), Palm tree seed (10), Clean Torstol (18-20), Clean Snapdragon (30)
Big bones (100%), Polypore stick, Polypore spore, Ganodermic flake, noted Grimy ranarr (2), noted Fire Talisman (27), Blood rune (8-50), Death rune (8-27), Palm tree seed, Yew seed, Papaya tree seed, noted Gorajian mushroom (12), Tooth half of key, Loop half of key, Watermelon seed (3), noted Clean toadflax (25-43), noted Flax (40), Spirit seed, Neem drupe, Rune 2h sword, Rune kiteshield, Rune sq shield, Rune bar, Rune battleaxe, noted Big bones (163), Dragon helm, Dragon dagger, noted Earth talisman (28), Dragonstone, Gold charm, Green charm, Crimson charm, Blue charm, noted Battlestaves (200), noted Adamantite ore (180-218), Rune arrows (150), noted Coal (652), Long bone, Curved bone, noted Silver ore (100), Coins (430-11,184), noted Yew logs (487), Snapdragon seed, Water talisman, Law runes (45), noted Pure Essence (1179)