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What Greenwood had revealed to the rest of the colors was nothing but shocking, a being with an immortal body, a true immortal body capable of regenerating from anything and without any weaknesses like those that Vampires.
Perhaps its only way to die would be to be disintegrated to an atomic level, or by having his soul crushed, his body could simply self-regenerate endlessly. Of course, Green or well, Greenwood didn't knew that Drake had the weakness of requiring a lot of calories and energy stockpiled to be capable of having such regeneration, so he had to eat a lot, several times his own size almost every day.
But even then, wasn't it still an amazing power? And as long as he had dungeons with him to supply him with monsters to eat, he could easily stockpile as many energies and calories as he wanted anyways.
Check "The Protagnist's Sister Is Actually the Strongest"!