Yes then story has been done many times by Vance, Moorcock, Tolkien, Wagner and to some degree Eddings. You can even go older than that with Beowulf poem and the Nowell codex as well as Authurian legends.

However, I wasn't looking to discuss my campaign, I was looking for feelings on "cheating" with magic that defy innate spell immunities.

I thank everyone for their input. I appreciate the comments made and enjoyed the back and forth discussion.