Bigby's Besieging Bolt
Evocation [Force]
Level: Sor/Wiz 6
Component: V, S, M
Casting Time: 1 round
Range: Long (400 ft. + 40 ft./level)
Effect: One siege bolt/2 caster levels
Duration: Concentration
Saving Throw: None
Spell Resistance: Yes

With this spell you are able to fire one magic siege bolt for every two caster levels. The bolts appear next to you and fling outward to attack buildings, walls, objects, other structures, and creatures as directed by you (which must be at least 100 feet away, but within range). You may launch one bolt each round for as long as you maintain concentration (although the spell ends once you have launched one bolt for every two caster levels). The bolts strike their target unerringly, and all damage inflicted is considered force damage. The type of siege missile the bolt mimics depends on your caster level.

Level   Siege Bolt          Damage
11th     Light catapult     4d6
13th     Heavy catapult   6d6
15th     Trebuchet          8d6

Material Component: A small stone sprinkled with diamond dust (worth 100 gold pieces).

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Spell converted from 1st Edition Advanced Dungeons & Dragons by Owain_Abjurer, posted on the D&D Boards.

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