I tried looking for some on the Vault but all I could find are visual haks; I couldn't find anything that replicates the weapons' abilities.
Has anyone tried to script this? For reference, here's what the d20 SRD says about brilliant energy weapons:
Brilliant Energy
A brilliant energy weapon has its significant portion transformed into
light, although this does not modify the item’s weight. It always gives
off light as a torch (20-foot radius). A brilliant energy weapon ignores
nonliving matter. Armor and shield bonuses to AC (including any enhancement bonuses
to that armor) do not count against it because the weapon passes
through armor. (Dexterity, deflection, dodge, natural armor, and other
such bonuses still apply.) A brilliant energy weapon cannot harm undead,
constructs, and objects. This property can only be applied to melee weapons, thrown weapons, and ammunition.
Strong transmutation; CL 16th; Craft Magic Arms and Armor, gaseous form, continual flame; Price +4 bonus.
Is this even possible in the NWN engine?