Amanitar

For ages, fungi and other benign forms of life have thrived in Ahn'kahet's damp sun-starved caverns. Only recently has Yogg-Saron spread its oppressive will into this isolated ecosystem. The Old God used its immense corruptive powers to warp one of Ahn'kahet's native beasts into a monstrous creature known as Amanitar, an unthinking terror bristling with the destructive energies of its master.