It's a speed rainbow, but I really just use all the creatures to weaken the creature and fractal something devastating near the end. For instance, I have a bunch of creatures out and the AI is at around 40 hp, I fractal Flesh Recluses for another 40+ damage. Or at the beginning after a bunch of supernovas, I fractal forest spectres and grow them all.
It's also kind of slow, so I use it for medium-fast EMs on Halfbloods.
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