To find Gidbinn in the Flayer Jungle, you must first travel to the Great Marsh which is past the Spider Forest. The trek is long but make sure to activate the Waypoints at both Great Marsh and Flayer Jungle so you can fast travel later. When you find the Gibdinn altar, light it and fight the mobs who will eventually drop The Gidbinn (dagger) itself. Deliver The Gidbinn to Ormus.