In a moment of madness, the previously tortured and crippled (his muscles are degenerated, his tendons and tongue cut) Griffith pushes the horses of the carriage he's been lying on after beeing rescued, and falls into a river. His friends of his mercenary troup follow to save him. In the river he finds a long lost trinket, which has been "waiting" for this moment, and summons a living hell of demons. The four almost allmighty "God Hand" appear on top of this and declare Griffith to be the long awaited fifth God Hand. He is beeing transformed into one of them, while his old comrades and friends are beeing slaugthered by the demons as a sacrifice for Griffith's rebirth. Griffith accepts this, because he already accepted that sacrifices were necessary to accomplish his dreams and aims of an own kingdom.
Gatsu, who is the strongest fighter amongst the mercenary and Griffith's closest friend, enters a berserk rage when he sees his friends beeing slaugthered and Griffith taken by the demons and slays dozens of demons. Apart from him, only his girlfriend Caska -who was unable to decide between her love for Gatsu and Griffith- survives, because another mercenary gives his life to safe her for a moment.
When Griffith is fully transformed and now is a powerful beeing, the demons capture Gatsu and Caska and Griffith rapes the woman in front of Gatsu's eyes, who, still raging, slashes on the demon holding his arm until his sword breaks, and then cuts off his own arm with the broken sword, only to be captured again and loosing an eye.
Both Gatsu and Caska survive, but Caska loses her mind after the events. The overall twist:
-Before: Griffith is stripped of all his previous power, glory and ambitions, while Gatsu and Caska finally thought to have found their places in life and within the mercenary troups, who follow them and feel ready for a new life.
-After: Griffith is a godlike beeing, Gatsu lost everything of value to him, Caska effectively doesn't exist anymore, the mercenary army is dead; The story has a full reset.