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Kuro and Raven had fought to protect Julia's life, just as Maria had commanded them. Both had fought bravely but ended being defeated by the Vampires at the end. Barely in the verge of having their souls leave their undead bodies, Maria managed to catch up to them through her Phantasmal Clones, and quickly decided to repair them. However, there was a problem, even if she repaired them, she lacked enough materials and time to actually make them strong enough to fight as of now.
Despite that, she planned to simply protect them inside her shadows. But they were unwilling. Her Undead wanted to fight and protect her as well. Ultimately, Maria took the decision to transform both of them into a single creature, a new Undead Chimera that emerged within her Soul Grimoire's Undead Creation list. It took a few minutes for them to completely fuse and evolve into this entity.