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.
After being freed of the corruption of the Emerald Nightmare, Eranikus was found by Lucan Foxblood shortly after traveling to Ashenvale with Tyrande Whisperwind and Broll Bearmantle. At various times throughout the story Eranikus assisted the adventurers when they were in dire straights, although he was hesitant to do so due to his fear of becoming corrupted again. During the fight to save Malfurion, Ysera was captured by the Nightmare. As the Nightmare's strength increased, Eranikus discovered that Ysera had not yet been corrupted and he arrived to help Lucan Foxblood free her from the prison where the Nightmare Lord had placed her. During the attack on the prison, Eranikus was confronted by Lethon and in his struggle to prevent being corrupted again he pushed himself and Lethon into a void, tearing Lethon apart and dragging Eranikus into the vortex. While several characters, such as Malfurion and Ysera, believes this to be the death of Eranikus, it was not actually confirmed whether if he died or not, as with Lethon.