In the epic fight at the God Quarry in “Avengers” #66, the heroes manage to score a major victory against Mephisto’s Council of Red, which consists of every version of the villain from different realities. The modern-day Avengers, the Avengers of 1,000,000 BC, and the heroes collected from other realities on behalf of the Avenger Prime give the thousands of Mephisto variants all they can handle, making a significant dent in their numbers.
The Council of Red tells Mephisto they are displeased, sentencing him to death for leading them into a bloodbath. However, Mephisto has other plans. Before he can be taken out, he kills the entire council, slashing through them in a bloody fashion and leaving their bodies stacked on one another as the last one standing. Then, Marvel’s devil casts a spell over their remains, causing the dead bodies to attach to him. The transformation is repulsive, Mephisto’s body swallowing the corpses of the council, and he ends up taking on a single form, becoming a Celestial-sized threat for the Avengers. The ultimate form of Mephisto takes down Captain Marvel’s Helicarier, quickly showing he’s gained the additional powers of the devils they killed.
Mephisto’s Ultimate Form Has Been Revealed Against The Greatest Avengers Team Ever