Concept: Guardian of the Living Gates
Legend has it that deep in the savage Ramaan Canyon lies the valley of the Lifetree, the first living thing in all creation. Many poor souls who have suffered loss seek this valley, for it is said that the seeds of the Lifetree can bring back loved ones from the Sea of Souls. Those who find the sacred gates to the vale, however, will rarely find what they seek, for only those who are worthy may tread that hallowed ground. All others will be turned back by the mighty Guardian of the Living Gates.
The Guardian is a powerful beast, about the size of a whale, and gifted with a keen intellect. It lazily floats about using it's psychic powers, which it directs through the knob on it's forehead. The exact magnitude of the being's psychic powers is unknown, as those fools who rouse it's wrath never live to tell the tale. Most people assume that the creature is immortal, but this is not technically true. In fact, the Guardian itself was gifted with a seed of the Lifetree long ago, which sustains it's life indefinitely.
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!