Soul Shatter

3rd-level abjuration
Casting time: 1 action
Range: Touch
Components: V,S
Duration: Concentration, up to 1 hour
You touch a weapon placing an infernal blessing on the weapon until the spell ends. Choose a target creature that you can see. The weapon deals an extra 1d6 cold damage to the target. If that creature is reduced to 10 or fewer hit points by an attack from the target weapon before the spell ends, the target must make a Charisma saving throw against your spell save DC, if it fails its soul is immediately transported to Stygia into the Glacial Bastion. While the soul is in the Glacial Bastion, life-restoring spells and effects, such as raise dead, reincarnation, and resurrection etc. cannot be used to revive the creature.
At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd and you may choose an additional target for each slot level above 3rd.
Special: Only Bladereavers can cast this spell.