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Although I managed to free the Vampires below her power by shattering her Divine Core, Red viciously revived herself from the dead. Not only by merging back every bloody piece of her body that exploded into shreds, but by also converging her divine core with the accessories she was wearing. I remember she had around two rings and one necklace imbued with red stones.
And if I am not dumb enough to not realize, those red stones were obviously the same as Ruby's necklace jewel, a fragment of the Vampire Venerable's soul! I should had tried taking them away from her but the only way to kill her was by blowing her into pieces. Getting closer and being meticulous wouldn't had worked.
The moment she converged with them completely unlike simply wearing them as accessories, the enormous shockwave that stopped all of us was unleashed. I tried my hardest to dive through such an enormous pressure, but I was only pushed back the harder I tried.
Check "The Protagnist's Sister Is Actually the Strongest"!