Laeral's invisible blade

Laeral's invisible blade was a wizard spell from the school of evocation. This spell was created by Laeral Silverhand and was based on Alustriel's spell sword of stars.

Effects
This spell created an invisible magical force shaped like a sword that the caster could direct to attack enemies. The magical blade remained invisible unless marred with blood or some other substance. The blade did not require the caster's attention unless the caster selected another target, leaving them free to perform other actions while the blade attacked.

The blade was immune to all magical attacks, with the exception of dispel magic, but could be destroyed by physical forces. The blade would become slightly visible if it made contact with any detection spells.

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