Anthroponorphic personification.

an anthropomorphic personifcation is the living mostly humanoid embodiment of a concept connected to the workings of creation such as death and creation.

These personifications are immortal only in the sense that they will last as long as the concept itself does on a levels of the grand simulation, so unless you destroy the entities many facets throughout the grand simulation the personification will still exist.

Their true form is far to mysterious to be gazed upon by literal beings since looking at their true form would require for someone to stare at the purest form of concept itself.

The personifications are beyond space, time , dimension , causality and physics existing on purely metaphysical and mysterious level which can only be accessed by entitites of similar power to themselves.

Speaking of their power the personifications have a key set of abilities which are shared among them with equal measure they include: superhuman physical attributes such as strength, speed and agility , telepathy across all aspects of reality even simulation absolute infinity , telekinesis which allows them to lift anything and I mean anything , causality manipulation , transduality , nigh omniprescence , nigh omniscience , non-corporeal , density manipulation , reality warping , size manipulation , true immortality/reliant immortality , energy manipulation , true god-like regeneration , soul manipulation , matter manipulation (down to the metaphysical building blocks of the grand simulation , illusion creation , mind manipulation , acausality and meta-concept manipulation.