"Your flames forcefully tear off a part of their Spiritual Heart and implant it onto your outline. Perhaps that's why it feels like a Chimera."
Hearing these words, Alice was silent.
According to what Velouria said then whenever she was drinking someone else's blood, she was taking a part of their soul into her.
That would indeed explain how she could gain their powers based on everything she knew regarding Sigils, the Abyss, Spiritual Heart and the contracts that were formed.
It was rather ironic to Alice. She who remained the most unaffected/normal in appearance was in fact tearing off someone's Spiritual Heart to copy their abilities.
"Could the damage done be repaired? Or is it permanent?" Alice asked curiously.
"It will repair itself in due time. But repeating the… 'extraction' on one person repeatedly will have consequences even if you don't kill them." Velouria explained.