Solution Epsilon serves as a slime battle maid within the "Pleiades Six Stars," guardians of the Great Tomb of Nazarick. Created by the guild member Herohero, she formed part of the last defense perimeter, designed to delay intruders until guild forces could muster in the throne room, recognizing her limitations against powerful players reaching that depth. Her appearance features curled blonde hair, blue eyes, and a deliberately revealing maid outfit that facilitates absorbing victims. As a slime, she freely alters her physical form for shapeshifting and disguise, possessing physical allure said to rival the most beautiful woman in the Re-Estize Kingdom. Solution views humans solely as food and toys, relishing the act of swallowing them alive and deliberately prolonging their suffering. She employs tactics like exposing her chest to lure lustful men into contact for absorption. Though adept at disguise—often posing as a childish, rude noblewoman during intelligence work—her true nature is logical and calculating. She criticizes perceived inefficiencies in allies like Sebas Tian or Entoma and holds absolute loyalty to Nazarick, willing to confront or betray superiors she deems a threat to the Tomb. Her chronological involvement spans several arcs: - In *The Bloody Valkyrie Arc*, she poses as a spoiled Baharuth Empire noblewoman with Sebas Tian as her butler. She devours a human named Zach with Shalltear Bloodfallen's permission, later discussing her predation methods. - During *The Men in the Kingdom Arc*, she alerts Ainz Ooal Gown about Sebas Tian's potential treachery for sheltering the human Tuare. She later assists Demiurge's scheme to elevate Momon's reputation, fighting disguised as a subordinate of Jaldabaoth. - At a grand court gathering in *The Invaders of the Large Tomb Arc*, she requests virgins as a reward; Ainz grants her captured criminals instead. - *The Pleiades Day Arc* reveals her jealousy toward Ainz's personal bathing attendant, Miyoshi. She kidnaps and conceals Miyoshi within her body to usurp his duties, resisting revealing his location until pressured by Yuri Alpha. Ainz forgives her, citing her status as "Herohero's daughter." - *Mass for the Dead Arc* depicts her temporary death during Nazarick's transfer to the New World. Revived by Momonga but severely level-depleted, she participates in reconnaissance against Chaos Beasts and aids Demiurge by consuming a human whose skin was harvested for leathercraft. Her abilities derive from slime racial levels and rogue-class skills. She is immune to normal physical attacks, absorbing slashing or piercing weapons; blunt force can harm her. She produces potent poisons—combining sleep-inducing and muscle-relaxing variants—injected via syringe-shaped fingers. Her stealth allows merging with shadows and emerging elsewhere. She extends whip-like limbs up to two meters for silent attacks and stores objects or humans internally, controlling digestion speed. Notable skills include "Decapitating Whip Cage" for physical damage and "Poison Bomb" for toxic magical attacks. Her modified maid armor, reinforced with magically enhanced metals like adamantium and mithril, offers defense comparable to full plate mail. Data Crystals, obtainable only by players above level 90, augment its properties. In the *Isekai Quartet* series, she appears within the ensemble cast but lacks significant individual development or plot relevance in its crossover narrative.