Merlin Of The Endless

What if Merlin was an Endless sibling but born thousands of years later through a human mother? What if that's why he is immortal and learned the ageing spell so quickly - as the Endless can take any form they wish. What if when Arthur and the nights are resurrected, if they ever truly died, are met with more horrors and monsters but not just Merlin to help defeat them.

CC: I do not own any of the characters, scenes or places that are shown in either show but I do own the story line/any new characters, scenes, places and the cover. Although some parts may by from the shows but mixed with my own ideas.