I tried to find the visual effect wich appears, when something is hit by the incinerate spell. (Level 2 Wizard)
It’s a high column of flame which shots up from the ground and has a duration of approx 1 sec.
The effect is then followed by VFX_DUR_INFERNO_CHEST or something similar. I seached the whole lexicon, but no avail …
As far as I can see, NWN1 doesn’t have a spell called Incinerate.
There is a level 2 Wizard spell called Combust, though.
A general method for discovering spell VFX constants is to find the spell in spells.2da to identify the spell script, then open the script to see what it uses.