After losing one of their precious companions because of the assassins sent by King Arthur, the Cavaliers sadly resume their journey. Io, a demon who knows the location of a passage to Camelot, guides them to Hell. In this kingdom full of miasms, they find themselves confronted with many threats, but also with much benevolence! This is an opportunity to discover a part of Percival's mysterious past... Under the protection of the wise King of Demons, the quest for the Four Knights of the Apocalypse passes to the higher level...