MGEND: Chthon's Vengeance

Chthon's Vengeance is the final map of Dimension of the Machine; here you must rematch with the fearsome Chthon, who is trying to exact his revenge on you for defeating him last time. Defeating him once again will kill him for good, and permanently end the diabolical being's plans.

Secrets

 * 1) After sinking Chthon the first time, you will gain access to the part of the map that contains the Silver Runekey; collecting it will make Chthon rise up for the second round. When you get to the elevator that takes you up to the Silver Runekey, simply run past the elevator instead, and go around the crates to reach the final Secret in the expansion, containing a Quad Damage (Q1).