Yeah, Kagha has awful AI.

Loves to Moonbeam herself and her allies.

Also, when the fight is over, if you've persuaded her against the Shadow Druids, if she has a Moonbeam still active (If by some miracle she didn't hit herself with it or run into it afterwards) the rest of the Druids like to walk through it and get fried.

Heck, I had one run where Kagha was the only Druid left standing as she'd fried all the others, even then, she was close to death from self-frying...

I've also had Wyll get stuck in a death loop... Where he survived on low HP, then after the fight ended he ran into the Moonbeam and got downed... So I quickly healed him before he died and then he got downed again... And again and again and again... (So I decided screw it. Let him die and go get the free Withers revive)