The Krohkur is letting me live out my dream of having a usable late-game crit longsword. With a Riven roll like that, how could I resist?

Berzerker can be subbed for [Primed Fury] for one fewer Forma, but personally I prefer the flat attack speed boost from PF. Organ Shatter can be used in place of the Amalgam version if you don't mind the heavy attack wind-up time in exchange for less capacity.