intrinsic

A built-in function that is implemented directly by the compiler, without any intermediate call to a library.

An ability possessed by a character and not requiring any external equipment.

“You can acquire the fire-resistance intrinsic by eating dragon meat.”

Innate, inherent, inseparable from the thing itself, essential.

“the intrinsic merit of an action”

(of a body part) Situated, produced, secreted in, or coming from inside an organ, tissue, muscle or member.