I find Up-Blast + Lightning (while still in the air) + Meteor (after the targets have already fallen) to be a good combo-farmer. I can get to 200~ combo while in Tutu's F4 stage. A bit overkill for an S-rank, but it's all about the combos, baby. >D
FFXIV(Midgardsormr): Euler Breslau - 60 SMN, AST, SCH, WHM, BRD, BLM, CUL, GSM, BTN, MIN, LTW, CRP, WVR
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