Primordial Sin Crown of Wrath
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FLAAAAASSSH!!!
Satan absorbed the fragment of his own main body's Archdemon Core, immediately boosting his strength through the roof once more.
And unlike other Demon Lords who consumed the Shard, when it came to he very vessel of the origin of these Shards, the effects were much better, stronger, and explosive than usual!
His body underwent several new changes, as black and red fur started growing across his body, his legs became like those of a minotaur, and his face transformed into some sort of lizard-like beast.
Above all, he grew another two heads, that of a black bull and another of a gray wolf, accompanied by two gigantic pairs of bat-like wings, and a long tail with many divided sections ending on snake-like heads.