Harrowing Spire will drop from containers in the game's new Descendia mode, with a drop chance of just 1%, according to the drop tables. Descendia can be accessed by finishing The Old Peace quest ...

The Vinquibus' 40% base crit chance makes it a good weapon for crit-heavy builds, such as the one above. It'll work best on melee-centric frames like Kullervo and valkyr, though it'll be decent with ...