This is the only boss I can't figure out how to kill solo on NG+7 with my lvl 106. All others I know how to beat consistently. He teleports behind and on top of me and gets me. When I try summoning instead of solo, no one I summon lasts. NG through NG+5 weren't problems, but +6 was very challenging and +7 is deadly. Only Dancer put up a challenge of the other boss fights, but not too much.