Kurobako

"I call this, my ultimate weapon, something I never got to make because I lacked the materials, but now I can make it. I call it...God's Weapon!"

- Lamia introducing the Black Box to Amon Kurobako (黒箱, Black Box), otherwise known as simply Kuro (黒, Black), is an artificial entity created and perfected by Lamia, calling it her "ultimate weapon", and even going as far as granting it the title God's Weapon (神の武器, Buki no Kami lit. Arms of Divinity). It was originally meant to be a non-sentient cube that follows verbal commands, but after Lamia's discovery of Black Blood, extracted from Amon, she immediately modified it to grant it a humanoid form, thus functioning as one of her numerous creations, and even "helpers", along with Hera and Frank respectively.

Trivia

 * Kuro's appearance is based off of Lieselotte Sherlock from Trinity Seven.
 * Despite technically being genderless, Kuro is identified by many, and herself, as female, due to her humanoid appearance.