Use the Abomination Assembly Kit in Halgrind and round up plagued Vrykul with your Mindless Abomination. Slay at least 20 and return to "Hacksaw" Jenny in New Agamand when you're done.
Well, here you are! Our friend's going to be somewhat... unstable. So I suggest not putting him together until reaching Halgrind.
Once you're there, use the abomination to round up as many vrykul as you can before self-destructing.
Come back with whatever's left once you're done. I can always use more body parts!