The rescued demoness (succubus) , intent on redemption, leads the party to a citadel where an admixture is made, that converts monsters to mythic nightmares. The party hopes to disrupt that supply chain, preventing non-mythic monsters from becoming mythic threats. The demoness leads the party to an entrance concealed by illusion, and the party faces off against 4 minotaur half fiends. Besting them, the part drops two more that were asleep, and comes across a female that parleys with them. An obvious demon, with a dead crusader at her feet, the party listens to her offer of a wish reward if we kill her rival, but decides she must die. A protracted battle (after she drops the illusion of a hot chick for her true form, a claw wielding huge demon), with her mirror imaging herself, leads to her teleporting out to save her life, vowing revenge as she warps out. EDIT: retcon, pally ability prevents the teleport, enabling the party to kill her in place! A mythic trial achieved, the party heals up and loots the room, and prepares for the next challenge.