Great sheets of flame engulfing whole forests,
Large and enduring bonfires....even lakes of fire...
Enormous building sized conflagrations, burning castles, citadels and more....
Wide corridors of flame and ash....rising high into the sky...
'>
Alas, Nwn still does not yet have such good expansive and enduring effects.... 
In addition to the above.....there was also:
Red Golem's material effects (mfx + addons) , It is in the vault....
A fire placeable could be replicated as part of the dynamic script.
That said,
New fire placeables need to be created which can get large over time.
Perhaps this would be a place where the Scale modifier in max could be useful in Nwn (?)
Maybe large 2d sprites could sport an animated fire texture <see other threads about this>
Alternately,
<imho>
A new animated 3d fire appearance/placeable may be tied to a "Game of Life" script
(which could allow a fire to spread and get larger)
Fire is as elemental as life.
I mean, it almost qualifies as a life-form.
Maybe some enterprising individual(s) should get "fired up" by this necessary project
'>
