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The plan was rather simple, the trio of Vampires would use Xanthus, the last Vampire Noble as a bait, purposely giving him the order of immediately trying to engage with the irregular.
Xanthus used to be a slave and was taken by Vampires, so until now, he had never considered the idea of disobeying their masters… Until they asked him to sacrifice himself for them.
However, due to the contract and pacts done to him, he could not refuse.
On his last moments, as Kireina was about to finish him off by eating his soul, he screamed, trying to stop her, wanting to tell her about the plan and the trap that was settled for her. He considered that if he were to tell her, he could save his life… but alas, he died.
Hendrik, Elisabetta, and Matilda used a teleportation artifact incrusted on Xanthus's soul, it activated the moment his soul was destroyed, and its pieces were eaten.
Check "The Protagonist's Sister Is Actually the Strongest"!