Amphisbaena

Amphisbaena is one of the Next Dolls created by Promestein. She was specifically built to defeat Erubetie, using the vibrations of her equipment and body to instantly destroy slime cells, turning them into mere liquid and preventing them from pooling back to Erubetie. However, Amphisbaena values her body parts, stating that she was built from rare materials and losing an arm would result an unnecessary rebuke from her creator.

Biography
At the end of Chapter 2, after Ilias declares war and Promestein lays siege on the Monster Lord’s Castle, the scientist presents Amphisbaena.

Continuing on in Chapter 3, Amphisbaena looks on as the battle progresses. When Luka is given the option to surrender, if he accepts Amphisbanea is instructed to take him to the Drain Lab; but upon his refusal Amphisbaena is ordered to cut off Luka’s limbs, but is saved upon a timely arrival of Tamamo. After Tamamo forces Promestein to order a retreat by scaring the lesser chimera, Amphisbaena is dismayed.

When Luka arrives in Undine’s Spring, Amphisbaena appears and attacks Erubetie; Luka pushes the Queen Slime out of the way. The chimera informs Erubetie that although normal attacks would just phase through her body, the attack meant for her was indeed fatal, and proves it by cutting off a section of Erubetie's slime when she tries to counterattack. Erubetie then tries a different attack by diving and attempting to restrain Amphisbaena, but her attack proves to be suicidal when the slime is destroyed by simply touching the chimera. This leaves Erubetie no option but to evade; Luka and Alice try to help, but are intercepted by Throne Eggiel. However, the angel is quickly made short work, and the duo assist the Queen Slime. Knowing that she is outmatched and values her body parts, Amphisbaena retreats.

Amphisbaena flees to the Drain Lab and apologizes for her failure. Promestein dismisses it, saying that she only failed because the angel sent to assist didn't buy enough time for her, and calls Eden incompetent.

Battle Overview
Amphisbaena is fought by Erubetie, not Luka. All of Erubetie's attacks results receiving Vibration Armor, but her overuse of this is the key to winning. After enough uses, Erubetie gains the ability to use Colony Fusion, which ends up killing Amphisbaena.

If Erubetie loses, Amphisbaena leaves to rape Luka using her vagina until he dies.

Trivia

 * Although the traditional depiction of Amphisbaena is a serpent with a head at each end, the monster may be more related to the original’s name as the “Queen Of Ants”.