Entoma Vasilissa Zeta is a battle maid of the Pleiades Six Stars, the combat unit safeguarding the Great Tomb of Nazarick, created by the guild member Genjiro. Her outward appearance mimics a young girl in traditional Japanese garb with mauve hair in twin chignons and bright red, unblinking eyes. This visible face is a mask-shaped insect, while her hair comprises rolled centipedes; she covers all skin except this false face. Her true form is an arachnoid blend of spider and human traits. She hides her naturally harsh voice using a specialized leech insect that steals vocal cords from humans, allowing her to speak with a stolen voice. After its destruction in battle, she acquired and uses the voice of Arche Eeb Rile Furt. Entoma consumes humans, particularly favoring men's muscular arms. When human prey is unavailable, she resorts to "green biscuits" or insects from Black Capsules. She is not indiscriminately aggressive, ignoring sated humans unless provoked. She enjoys hunting by weaving webs across Nazarick's 3rd and 6th Floors as traps, relishing the chase. She possesses intense pride in her role, appearance, and purpose as designed by her creator. This pride ignites fury and lasting grudges against those insulting her function or damaging her possessions, especially Evileye of the Blue Roses. Entoma explicitly seeks vengeance against Evileye for destroying her voice-mimicking insect and clothing while mocking her worth as a maid. Originally serving as a distraction against invaders in YGGDRASIL, Entoma participates in several operations after Nazarick's transition: evaluating Cocytus' leadership during the Lizardman campaign and relaying Ainz's summons; expressing envy that other maids receive direct orders from Ainz during a Pleiades tea party, spilling blood into CZ Delta's drink (resulting in forced consumption as punishment), and advocating for using live human interrogation subjects for consumption; killing and eating bodyguards during the raid on Hilma's mansion, leading to a battle where Gagaran attacked her and Tia and Evileye intervened – Evileye's insecticide spell destroyed her voice insect, nearly killing her until Demiurge intervened; posing as one of Jaldabaoth's subordinates alongside Lupusregina and Solution in Demiurge's scheme to elevate Momon's reputation; receiving permission from Ainz to kill Evileye if encountered again after the Jaldabaoth operation; desiring to consume severed arms during the worker invasion of Nazarick but being prevented by Yuri Alpha, who emphasized corpse collection for experiments, subsequently acquiring Arche's vocal cords; requesting permission to weave webs within the tomb for hunting while stationed as a sentry in Nazarick's surface cabin. Her combat abilities focus on spirit magic, utilizing summoned insects and magical talismans. Key insects include: the Mask Bug forming her facial disguise; the Mouth-tongue Bug (Voice-Mimicking Insect) stealing and reproducing voices; the Bullet Bug functioning as a biological Gatling gun; the Blade Bug usable as a sword or projectile; the Hard Armor Bug deploying as a shield; and the Thousand Lash Bug, a giant centipede over 10 meters long. Her talismans trigger magical effects, like the Lightning Bird Talisman discharging electricity. Combat weaknesses include vulnerability to insecticide and a delay in summoning insects. In the crossover *Isekai Quartet*, she appears within the ensemble cast without unique character development detailed in the available materials.