死鎖呪・オリヴィア・コピー
from The Hidden Dungeon Only I Can Enter
Appearance: Both her hair, face, and even clothes were just like Olivia’s, but Fake Olivia has properly open eyes and can move. Even the voice isn’t telepathy. She uses vocal organs. Personality: She has the same stupid manner of speaking and smile as Olivia. Background: Fake Olivia is an imperfect copy of Olivia Servant created by the Death Chains. Noir and Emma found her trapped in a stone monument in the 15th Floor of the Unending Dungeon. After they released her, Fake Olivia attacked them to test her skills, but because she was too powerful, they retreated to the 2th Floor. Fake Olivia got out of the Unending Dungeon, attacking people, stealing a sword from a mercenary which she bestowed with skills and gaining LP. Noir, alongside Emma, Luna and Leila, fought against her, and after a exhausting fight, he was able to kill her, destroying the Deaths Chains and releasing the real Olivia.

The Hidden Dungeon Only I Can Enter
Third son of a "beggar noble" Nore lost his job and was at a loss. But as he was contemplating whether to become an adventurer fortune struck. A Hidden Dungeon that no one knows how to enter. A legendary place full of hidden things like extremely rare magical beasts, magic tools for gaining power and items that would be scarce all over the world. That's the kind of entrance that was opened. (Source: Novel Updates)