Calamity of Enshu is surprisingly good if you tie Skirk to a shielder. The other options probably perform much worse than C6 Dahlia. I'd be happy with PJC if I had one, because unlike some characters, Skirk's weapon is just a statstick that doesn't offer anything for her mechanics, that makes it less appealing to me. Mistsplitter, Haran and maybe Absolution work too. If I had to run Finale of the Deep or R5 Black Sword, I'd pull R1.