Essential Flame

Area
As for Create Fire, except that the fire created is the magical essence of
fire. Any mage can tell the difference by looking. It cannot be extinguished
by ordinary water or ordinary magic, but only by a similar quantity of
Essential Water or by a Dispel Magic spell. Essential Flame does +1 dam-
age to anyone it burns (+2 to watery creatures).

Duration: 1 minute.
Base cost: 3. 2 to maintain. This flame ignites all flammable materials,
and the entire blaze remains Essential as long as the spell is maintained. If
the spell is not maintained, any materials that were ignited continue
to burn with ordinary flame.
Time to cast: 3 seconds.
Prerequisites: At least six other Fire spells.

Item
Wand, staff, or jewelry. Usable only by mages.
Energy cost to create: 800; must include a $400 ruby.