Because of this, though his body appeared to be a bundle of organs inside a skeleton wrapped in muscle and skin, it only looked that way. His actual existence was composed of black ash like particles of semi-solid magic energy that came together and took a form that imitated the cells of Harry's body. When observed, you couldn't even tell there was anything special about the cells until they broke down. It was a flawless imitation.

Harry Potter The Mutant Obscurus Gamer
Book&Literature · GnomeBob
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