Proper positioning helps a lot, too. The way I did it was similar to what omegazen described:
1. On the way in, I grabbed the oil barrels.
2. Just before you get to the area she's in, there's a narrow choke point: I put the barrels there.
3. I sent my tankiest character in to talk to her and kept the other 3 back.
4. When the fight triggered, I just ran my tank back as far as possible on his turns, leading all the other characters to follow. He took some hits, but was able to shrug it off.
5. Once he'd passed the oil barrels, I had my archer shoot the barrels to slow everybody else. The bugs won't be slowed, but they still get bunched up with everyone else.
6. Once most of them had bunched up, I set the oil on fire, thus making them run through it to get to my party. I believe only Radeka is immune to fire, and she'd leapt to a high vantage point and then couldn't follow when my tank ran out of the area.
7. Everybody else got funneled through the choke point, where it was easy to pick them off one by one, even though my team was doing physical damage and the fire was dealing them magic damage.
My characters stayed back out of the fire and forced everyone to come to them. Only the bugs have ranged attacks, which archers are perfectly equipped to deal with. Once everyone else was dead, it was easy to move the party forward and take Radeka out.
Last edited by JosieJ; 26/10/17 07:05 PM.