This spell split a magical or non-magical missile into a smaller replicas of the original. 2 + 1 per lvl of caster can be created. Each missile can do damage equal to the original missiles damage divide by the number created, the minimum damage is 1hp. If the magical missile offers a saving throw to halve damage this still holds, and the original magical missile must be cast first.
The material components - The original missile, piece of silk soaked in holy water which is squeezed over the missile as the spell is cast.