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There are also randomly appearing bonus floors which can contain superbosses (Colosseum, Hades). In the "Carnage" Labyrinth, this appears every 5 floors instead, and the superboss fight is no longer optional.
In the regular Labyrinth, every 100 floors, there is an optional superboss fight (blue flame). This guide covers the Labyrinth of Chaos in Monster Girl Quest Paradox v2.41.
Cursed Sword Sisters (Executioner, Ogretooth, Mysteltainn) (ROBFS4U), Succubus Prison Trio (Myusca, Nemea, Vinum), Parade Buster Trio (Bell, Lyla, Musette), Fulbeua (Succubus Rhapsodia), Gilgorn (Succubus Rhapsodia), Daji (SHRIFT), Est (Succubus Quest). Black Alice (1st Form), Black Alice (2nd Form), Doppels (Holly, Rinoa, Heine, Kyrie), Heinrich (Angel Killer), Marcellus (Monster Lord Slayer), Judgement, Worldbreaker, Idea Lukas.
Leviathan, Alma Elma, Granberia, Sun Wukong, Yamata no Orochi, Tezcatlipoca, Quetzalcoatl, Gnosis, Zion, Erubetie, Lilith, Azi Dahaka, Eden, Sonya Chaos, Tamamo no Mae, Black Alice (3rd Form), Cassandra. Morrigan, Sphinx, Astaroth, Adramelech, Alice XVI, Reaper, Sonya Mazuda, Sonya Mainyu, Micaela, Lucifina.