Viscidus is an optional boss in the Temple of Ahn'Qiraj, a giant slime that can be accessed after the death of Fankriss the Unyielding. This boss requires a high Nature Resistance as it uses AoE poison bolts which have direct damage along with DoTs. He resets if taken outside his room, much like the bosses in Zul'Gurub. If you are about to wipe, run outside the room and you may be able to save your life.