Deltarune Chapter 2 - QUEEN defeated in ONLY 4 turns (world record)
this took WAY too long...
Definitely one of the hardest things i have done in this game as of now, as it requires many crits in a row, near flawless grazing and decent RNG for the acid droplets. But yeah, here it is, in only 4 turns.
I REALLY don't believe it's possible to do this in even less turns, but feel free to prove me wrong.