Blade of Sehanine

The Blade of Sehanine is a rare greatsword. It has the word "Sehanine" in Sylvan along the blade which softly glows green. When examined closely the wood's grain can be seen to be made of countless smaller swords. When the sword's charge is expended the green glow of the Sylvan words fade.

Abilities
The wielder gains a -3 bonus to attack and damage rolls made with this magic weapon.

As an action the wielder can expend the sword's charge to plunge the greatsword into the ground and cast the  Blade Barrier  spell. The sword bursts into the whirling magical blades that make up the barrier. After the spell ends the blades reforge back into the greatsword in the place where the spell was cast.

The sword must be left under moonlight for an hour to recover its charge.