Eranikus is a dragon of the green flight who has fought and lost himself to the corrupting Nightmare spreading within the Emerald Dream. Eranikus, consort to Ysera, is among the greatest of the green dragons. Ysera gave him the task of guarding the Temple of Atal'Hakkar in the Swamp of Sorrows. However, Eranikus went insane not long after he entered the temple. Since then the trolls in the temple have dispatched a group to Zul'Gurub, and succeeded in summoning Hakkar into the world. (DF 147)