Vanilla Delayed Blast Fireball

Delayed Blast Fireball
(Invocation/Evocation)

Level: 7
Range: 40 ft.
Duration: Special
Casting Time: 7
Area of Effect: 11-ft. radius
Saving Throw: 1/2

This spell creates a Fireball that hovers at a point determined by the caster. The Fireball will stay in position until someone walks too close to it; at that point, it will explode, dealing 15d6 points of damage. Victims are allowed a Saving Throw vs. Spell for half damage.