Mr Khan said: Damn, that sleep-inducing UM is indeed an affinity machine, so long as the two others in your party are the type to frequently auto-attack (e.g., if Melia or Sharla is involved in the bond, you should control them. Of course, Sharla has the double-whammy problem of auto-attacking from a distance) |
Sleep resistant gems on the last character, tell the other characters to hold back, build up your link attack, Topple and never look back.
I'm pretty sure that's what I did for that enemy, although it's been a while, so I don't know for sure. It works on every boss that's not immune to topple, although the spike-on-topple (...) ones need specialized gems too.