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Redgaria felt shocked, although she was now in a different body, as Hel had only taken away her soul, it was still her! His sister, the young Annabelle, that was long ago sacrificed to Hel because of her strong soul filled with God Blessings.
Back then, in Redgaria's original Kingdom, to secure good fortune and prosperity, the priests that prayed to the Goddess of Death, Hel, offered her sacrifices in the form of the souls of the most talented, blessed children.
This even included the royal family, Redgaria's sister, who was blessed with many divine protections of several gods, was sacrificed gruesomely.
He was unable to stop this from happening, and even though he used his powers to kill everyone in the Kingdom in a fit of pure rage and resentment, a sin he has grown to regret, he was neve able to find her soul.
Check "The Protagonist's Sister Is Actually the Strongest"!