MonsterEnvy
Legend
• I have the mysterious drow figure who created the four weapons as the actual cult leader, with the prophets right under him. He's an ancient lich from the days when this complex was a drow city that worshipped Ghaunadar/Tharizdun/The Elder Elemental Eye and he's been working a long time to bring this to pass.
We actually know quite a bit about that Drow. Vizeran DeVir he is a major character in Out of the Abyss.
Though since you decided to do your own thing, that connection is not likely to happen now.