(Major Spoilers)
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So here I was, preparing to fight Irenicus on the Tree of Life. So I buffed 'em up, cast Mass Invisibility, and killed the last parasite. As expected my party was teleported to where Irenicus was standing.
After the dialogue was completed, instead of charging head on I simply walked away while Jon cast his numerous spells. By the time he finished, we were out of sight. I had Imoen and Aerie approach a careful stand-off distance from where he was stading, and started casting cloudkills and fireballs.
And that was it. The rest of the party stood around admiring the leaves and the birds while the cloudkills (about 3 or 4 clouds in total) did their stuff. Pretty soon Irenicus was done for.
Now, is this cheesy of what?