Grandmaster Ibo is the magic sub-boss in the Guthix section in the God Wars Dungeon. Ibo casts poisoning "spheres" like Janai Protex does (but only hitting 1 player, instead of everyone). He is considered as the weakest Guthix-sub-boss, due his weak defence stats. His defence may be low, but his magic attacks are very accurate and can hit very high damage on a player. He can also drop a Void rune, but the chances of receiving the drop are close to 1 in 5000.