Desperation Demon - Yellow-Eyed Devil

Within the treacherous depths of the Infernum, dwell the Desperation Demons, enigmatic planar beings notorious for their skill in striking Faustian bargains.
Known as the "yellow-eyed Demons," these demonic creatures possess a peculiar ability to assume the form of any mortal race with uncanny perfection, save for their unnerving, piercing yellow eyes that betray their infernal nature.
Manifesting solely during a mortal's direst hour of desperation, the yellow-eyed Demons exploit the very fabric of reality that governs the realms, momentarily halting the flow of time to grace the desperate with their presence. It is during this interlude that they proffer their insidious deals, shrouded in an illusion of benignity and ambiguity. Should one be foolish or desperate enough to accept their deceitful proposition, they shall be granted the infamous boon known as "Borrowed Power," a transitory infusion of supernatural might bestowed upon the hapless recipient.
Examples of the effects of Borrowed Power:

Unleash an empowered fireball of devastating potency in an instant.
Temporarily elevate two of their attributes to an god-like score of 25.
Summon forth a formidable Wrathguard.
Execute flawlessly the enchantment of 'Mind Control' with immediate success.
However, the specific manifestation of Borrowed Power hinges upon the dire straits in which the individual finds themselves in.

Demon, S-Rank Threat