Any tips on beating it?
I can easily hack through 3 of it's tentacles, jump on, hack at, and roll off the QTE swooping one, but when the rocks start flying I'm kind of lost.
Right after the QTE there should be a pile of rubble in front of you on the left hand side of the field as you face the Kayran. You should be able to run up it. You WILL take a couple of hits but once at the top there should be a cutscene and Geralt will finish it off on his own.