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He's a stupid RNG boss, yes, but he's beatable. It just requires patience and some form of quick range attack (Throwing knife, farron dart, etc) for phase 2. Also, being good at dodge rolls.
If you're absolutely stuck on him, I guess I could try switching to the PS4 version for a bit (Yay for having to have two versions of the game because my friends are in two playerbases) and help you. Or if you just want a general strategy I could give my 2 cents on how to kill him.
twitch.tv/retronutcase (no schedule, best to follow if you want to know when I'm on)
Took me a couple of tries but i just beat him. I found the first phase easy, and my strategy for the second phase was to dodge spells and take out all the clones before going in for damage on the sage. Never stop moving. Good luck! :)