By casting both fire bolt and control fire, 2 or more people can create a compressed fire bolt that, upon impact, does 5d10 fire damage plus the combined main spell casting ability (Charisma, Wisdom or Intelligence) plus the level of the caster, all done per caster, to any target creature within a radius of 20 ft of where the spell is casted. If interrupted the spell will combust causing 4d10 on a failed DC saving throw of 17 (Dexterity), and half as much on a successful roll of fire damage to anyone within 25 ft.
All casters must have fire bolt, and at least 1 must have control flames.
If 10 casters or more contribute to the spell, the fire bolt becomes extremely volatile, and on a successful cast, creates a crater 50 ft in diameter and 20 ft deep, radiating out from the point the spell hits. Any creature within this radius, including those underground, must make a DC saving throw (Dexterity) of 17 or more or be subjected to 10d6 bludgeoning damage, and on a successful throw will be subjected to half as much.
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