Savant's Force window can knock Thremnats off the platforms with its barrier. otherwise, I use Breakpoint and Gigavolt, which are both pretty effective. I try to group a bunch of Thremnats on the left by baiting their attacks with precise teleports, though it's pretty inconsistent and can go faster, especially if I can keep the one that drops Lightning close to swap to Gigavolt for better AoE damage. most of the combo weapons have potential here, so it's also possible there could be a better strat with other weapons.
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