Is the Black Knight's RES salvagable?

He hits 22 with max merge, which is only 3 less that neutral Zelgius of max merge. It won’t reach an amazing level, but Distant Defense seal will bring it to 28, or Brazen atk/res will bring him to 29, while making him even more deadly. 29 res outside buffs and Spurs is pretty good. Not amazing, but usable.

I mean you could go for Slaying Edge+Black Luna+ Special Spiral for instant Black Luna. I wouldn’t kill Kliff for him, but I can’t really think of any other replacements than Brazen skills. His Res is too low.

Well, he'll never be a res tank, that's for sure.

It could work, but only if you have some way to heal him afterwards, since he doesn't have aether for himself

Drop that A skill and grab Warding Breath for him. Give him Bold Fighter, Refine Slaying Edge for Res, and boom, same res but sacrificing distant counter and 32 res on EP. Use a brazen seal and res wave and boom, when below 80% on even or odd moves, he can reach 45 res. GG