User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-7003590-20130313013539/@comment-3146930-20130313031741

The sword has the power to send a soul to the Underworld or raise the dead. It is hinted that it has the power to raise souls from Tartarus, but considering how messed up the gods are right now, I doubt Hades/Pluto has that kind of focus.