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Even in his enraged and mindless state, King Pride was still aware that something went horribly wrong since these ladies appeared. This became even more obvious when he felt an alarming drain in his energy reserves.
Having devoured the Sin of Sloth, the well of power he could tap pretty much doubled. A single insignia of sin already has a deep well of power accessible to its holders; having two is too much even for King Pride himself, which caused him to fall into this state.
With these two wells accessible to him, King Pride should've been unstoppable. He could theoretically fight for weeks or months nonstop. However, something went horribly wrong just now. He felt both wells of his powee draining at a very alarming rate.
His reason might've devolved to its basic instincts, but King Pride could still tell what's happening to his body. There is a substance in his body that's causing this frightening drain.