To cast this spell the Mage must first prepare an enchanted sphere of red copper on which mystical designs are etched. This sphere is value 8 and has a Crafting (Mining / Smithing) Difficulty of 14. As part of the crafting process the Mage must cast the spell 3 times on 3 consecutive days, using 11 Fatigue and -10 Difficulty for each casting.
To activate the sphere the Mage casts it into an open fire (use Ranged / Thrown skill against a Defence of 10 - Size as given below), and makes a quick Channelling roll. If the throw and the casting are successful all the flame instantly rises up into a ball of fire which then explodes, doing D10+X damage where X depends on the size of the fire, 3 for a cook fire, 6 for a campfire, 9 for a large grate and 12 for a bonfire, to all in a 7 Legats radius. Each target may roll Agility resisted by 13 to take only 1/2 damage. After the explosion there is a chance equal to 7 or less on a D20 that the sphere is damaged and cannot be used to cast the spell again.
power+2 damage per Power Level
+1 chance of sphere being intact per Power Level