Chrome

The mastermind behind the Haunted Mansion, Chrome is a succubus who devoted herself to the arts of necromancy.

Encyclopedia Entry
"A monster with top-notch necromantic abilities. Chrome is a type of succubus, but her powers of seduction aren't too high. She's obsessed with satisfying her curiosity and is going to extreme lengths to create the perfect Zombie. Chrome believes that Fredrika, her ultimate creation, still holds room for improvement. through her powers of seduction as a succubus aren't very high, her ability to summon zombies is very dangerous. Even a skilled adventurer can quickly be overwhelmed by the zombies she summons.

''Up until now, her crimes were limited to grave robbing. Recently, she's taken a great interest in genital experiments between living humans and her zombies. If not rooted out by Alice and Luka, she may have gone on to even more inhuman experiments. However, after being terrified by Alice's assault, she regretfully discontinued her zombies experiments. She returned to her residence and is now researching ghost monsters..."''

Trivia

 * Her Encyclopedia entry and the fact that she is allied with Promestein suggests she will return in Chapter 3.