You only need to bring 3 spells for this fight. Terra Magica, Azur Comet, and Adula's MB. It really worked for me, although it was a bit hard when he uses Elden stars due to my build having only 11 points in vigor (16 after rune arc), but that's where Tiche helps out with her skill damage and dot. Bloodhound's step for i-frames and mobility.