After reading UserUnfriendly's informative guide on using multiple point-blank area effect spell casters to decimate enemies in an entire area, I was very curious to try it and see how well it really works in an average, non-tweaked party.
It was Imoen against a party of 3 fighters and 1 caster. Our group ran into their party head on and their caster quickly Contingencied stoneskin and another protective spell. Imoen then casts shadow door, and swapped on the boots of speed. Charging into the middle of that group with 2 fighters and the caster in range, Imoen turned on the Sunfire and almost killed the caster, severely injuried 2 of the fighters.
In another replay when that dive bombing tactic was not used, the drow group took a bit longer to dispatch, and the caster was able to throw in some spells (I believe it was a Chaos followed by Lightening).
Are there any better dive-bomb tactics which mages haste in under invisiblily and unleash point blank area damages?