Universal Shapeshift

Universal Shapeshift (万能変化) is an Extra Skill created by Rimuru's Unique Skill Great Sage that combined the "Mimicry" of his Unique Skill Predator with the "Synthesis" and "Separate" of his Unique Skill Degenerate. It is also an Intrinsic Skill inherent to the True Dragons.

Abilities
It allows the user to freely alter their bodily properties into whatever they desire, with hardly any effort. It is also incredibly useful in disguising one's appearance. It requires a minor amount of magicules to utilize.

In his confrontation with Hinata, Rimuru had used this skill in a last-ditch effort to transform his body into one that boasted only the most useful aspects of every monster he had consumed in the past. With no magicules to create a magical corpus, however, he simply absorbed everything in his surroundings to create his new physical form.