[x] Plan Priorities
-[x] Get as close as possible. Pre-cast Conundrum if it's definitely viable, but not if there's any chance.
-[x] Blast Fate and Fantasia with Argent Star (2 at fantasia, rest at Fate.) Use the immediate echo trick and try not to give them a chance to interpose anything. Then try to close to melee range and attack.
-[x] Use Aethyric Tide, switch to Stygian Tempest if it can't pierce a Defence.
-[x] Fate and Fantasia are priority if they lived, otherwise Angel or whichever is easiest to attack at the moment.
-[x] Try to avoid being in melee with more than one at a time, but try to stay close enough to one that area spells will hit them
-[x] Skill negate everything, try to kill them with ripostes.
-[x] If you get another spell, use whatever helps at the time.
-[x] Throw Argent Star if they fly out of range.
-[x] Seal Reaper's will first. If necessary, seal Stardust Striker. Last seal whichever you don't need.