Alustriel's sword of stars

Alustriel's sword of stars was a wizard spell from the school of evocation created by Alustriel Silverhand.

Effects
This spell created a shimmering magical force that appeared as a large greatsword. The sword appeared a minute after the spell was cast, floating around to attack a chosen target. The sword attacked twice with each attempt at striking the target. The sword did not require the caster's attention once assigned a target. A sword of stars was immune to all magic attempting to harm it.

Components
In addition to verbal and somatic components, this spell required as a material component a metal-bladed weapon to cast. The weapon was consumed during casting.