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As I fell into pieces, I realized I had managed to hurt the Phoenix quite a lot. Although I lost around 70% of my entire body in the process, the bastard was no way below 30% of its total HP, I would say even almost at 20%! Of course, my near-suicidal attack could easily become nothing if the bastard regenerated quick enough. His entire body was covered on holy flames, healing all wounds slowly, even broken bones and destroyed organs were regenerating at a fast speed, amazingly so. If we didn't destroy him before he could regenerate any further, we won't be able to beat him for real… or not if we don't sacrifice something.
Check "The Protagnist's Sister Is Actually the Strongest"!