Yeah, I try to do that. But those rain puddles don't even last 2 turns, do they? I'm pretty disappointed in the duration of some of that stuff. Summoning the spider beforehand helps a little - which I do when I can. So I am trying to utilze this stuff. In my last attempt at this group, I puddle-stunned like 4 of them - for the 2 turns it lasts. It helps, but I still lose. Just too many of them...
Puddles tend to last longer if you keep them perpetually shocked, if that's not too "cheesy" for you.