A truly strong attack spell this is.
Casting it will turn the hands of the mage into literal flamethrower, shooting a wave of fire against the foes, seriously burning if not outright killing them. However, the spell has to be used with caution, since it doesn't discriminate between friend and foe.
Lore[]
In Flam Hur causes the wind itself to catch fire and devastate all in its path. Those who intone this spell can direct the flaming wind in a deadly spreading wedge. All creatures in the path of this wedge are severely burned; few ever survive. Careless misdirection of In Flam Hur over one's own companions may result in their deaths as well. Sulphurous ash, blood moss and mandrake root combine best for this spell in an iron cauldron over great heat.
- from Book of Lore (Ultima V)