The Most Powerful Myths

Fantasy writers ground their narratives in the most powerful myths which, in Northern Europe, are Norse and Biblical:

I need hardly list Poul Anderson's Norse-related works yet again;

in Steve Matuchek's first case, he contends with an afreet bound by Solomon's seal, thus combining Koranic and Biblical myths;

in Matucheck's fourth case, he invades Hell;

CS Lewis' Ransom Trilogy replays the Temptation of Eve and the Curse of Babel;

the Phantom Stranger's speculative secret origins include that he is a neutral angel or the Wandering Jew;

Alan Moore's John Constantine and Swamp Thing oppose evil magicians conjuring the Original Darkness that was before the Creation which they believe will destroy Heaven;

Roy Thomas' World War II superheroes cannot invade German-occupied territory because Hitler holds the Spear of Destiny which gained magical powers when it pierced Christ's side on the cross - and at the end he uses it to conjure Ragnarok;

James Blish's magicians cause Armageddon;

Neil Gaiman's and Mike Carey's characters have equally apocalyptic adventures.

These are the most powerful examples that I know of and Poul Anderson is up there with the best of them.