Esther's weapon

Esther weilds a sword crafted from an unknown ore found deep within the recesses of earth's core. It was forged in darkfire harvested from the pattern of tattoos on Narss's body and in his home. It is able to cut through three feet of steel like it was butter. The red core is bloodstone, able to rip someone's being out of them, and make them a puppet to the wielder.
It emits tendrils of power when in battle, extending the range by at least four to five inches.

He calls the blade Mourn.