Been away from doing last wish for a while and last time I did it in season 9 it was doable with swords. I know they changed swords in season 10 so how is it done today?
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Along with what others have said, I would like to suggest that you wear as much Dreaming City Reverie Dawn armor as you can, as each Rivens Curse/Transcendent Blessing mod increases your damage by 5%, up to 25% with a full set. This is on top of regular buff/debuffs like bubble/well and tractor cannon.