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Zubekh, the fusion between three damned Gods that had given Kireina a big pain in the ass back then had been growing stronger by devouring other gods and also selling all sorts of items they were able to make…
However, this wasn't enough, now that Kireina had become a Supreme Goddess, they felt incredibly overwhelmed. They had believed they were actually ahead of Kireina's development when they became Great Gods and flew to the outside of the Realm of Vida seeking the power of the Aztlan Realm, where there was a fragment of the core of the world which they could eat to grow even stronger…
Check "The Protagonist's Sister Is Actually the Strongest"!