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Boss: Five Demonlords (Mesostel Pa, Mesostel Ze, Perivolcan Pa, Perivolcan Ze, Aphelion), plus the Avatar (HP 954, ATK 75, Physical Resist 25%, Magical Resist 75%, Berserk 25%)
Defeating any Demonlord will give one layer of Death Protection to another one. Defeating all five will unlock the entrance to a circular arena where the Avatar resides.
Striking the Avatar produces several level 10 "???" enemies, with random palette swaps and abilities.