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"Soul Eaters?" I wondered. "What's that? Like the Undead we fought back then?"
"Undead such as ghosts and so on are different than Hollows." Said the Great Spirit. "Hollows are beings born originally from negative energies and corruption. Because of that, they might desire a soul and life even more than Undead, who once had it. Soul Eaters are incredibly dangerous Hollows born every dozens of years. It takes several Life Draining Hollows to devour one another to reach this form. A Soul Eater not only can drain Mana and Life but devour Souls. The more it devours, the stronger its own soul will become. With this, they also become incredibly intelligent, cunning, and malicious!"
"You're scaring us now…" Rita sighed. "Well, let's make sure something like that never shows up in here. We can always just hunt a few every week, that should do it anyways."
Check "The Protagnist's Sister Is Actually the Strongest"!