Well, it's either I with you or against you...then I have to say I'm with you on this one. Albeit, your character is a tad bit OP, but like I said before, he hardly ever shows up. Therefore, going on an adventure to find a weapon that can do harm to him sounds grand, because it doesn't hurt to be prepared for the future. I mean, honestly, your character reminds of a boss fight where you have to use a specific weapon in order to actually deal damage. The fun part is the hunt for that weapon. Therefore, I say nay to nerfing your character.