I like it, but it's not my favorite of yours. The cultists is centuries, maybe millennia old, gathering all of the knowledge and wisdom of dozens of lifetimes of experience, and it still has the mindset of a Bond villain. "Oh, you wily British bastards, you may have stopped my evil plans this time, but you will not stop me for long! Let me explain in detail why I am an inhuman freak of biology and theology, and detail for you approximately what I had planned on doing! Let me do this repeatedly, in every new iteration of my existence, until somebody inevitably connects all of the dots together and learns how to contain me! (evil laughter)"
I do like it, though not enough for an upvote. It just seems really first-season X-Files to me.