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Keywords are:  'necromancer spell demonfire fire'

Spell: demonfire                Mana:  13  Int: 35  Wis: 33  Lvl 36 Necr  (21%)
                                (important)   Requires: demonic favor
                                Group: Necromancer Demonlore
                                Damage Type: fire
                                Damage:  (special, see text)  
                                Speed: average

Usage:
cast demonfire
cast demonfire <target>
cast demonfire <target> <stone>

The 'demonfire' spell uses a soulstone to bargain with fire demons
directly.  The spell is cast on the stone, and once the demons have
accepted the bargain, the stone is taken and fire erupts under the target.

This is a very dangerous and expensive spell, and the amount of damage
done increases significantly with soulstone level.