As a player, I never really paid much attention to the rules in D&D for creating new, unique spells. This is the one exception.
After encountering several situations where I would have liked to have taken advantage of the high damage potential of a Fireball or Lightning Bolt, but found my character in too small an area to employ one safely, I decided to solve the problem by creating a sort of hybrid single-target spell in the Magic Missile vein. Enjoy!
Silverglade's Forcebolt (Evocation)
Range: 10" + 1"/level
Area of Effect: One creature or object
Components: V, S
Casting Time: 3 segments
Saving Throw: 1/2
Upon casting this spell, a fist-sized ball of pale green fire darts forth from the magic-user's outstretched hand and unerringly strikes a single targeted creature or object within range, blossoming into a small (one foot diameter) concussive explosion upon impact.
Creatures struck suffer 1d6 damage per level of the magic-user, with a saving throw allowed for half damage. Because of the great difficulty involved in avoiding a direct hit from this spell in favor of a more glancing blow, this saving throw incurs a -2 penalty. The extent of damage to inanimate objects is best assessed by the referee on a case-by-case basis (optional rules for item saving throws may be helpful here).
Despite its appearance, this spell is a form of visible telekinetic force, not a true flame. Thus, resistance to normal or magical fire provides no special protection against it.
Collage Maps, Adventure-writing Process, A City of Cheese - Matt Finch (Frog God Games, Swords & Wizardry, Tome of Adventure Design, Spire of Iron and Crystal, cats and dogs living together) and I had a loooooooooon...
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