The Wraithverge is a
weapon from Hexen. Parias, the Cleric, uses this weapon. It is a staff (verge) whose visible part is a large, ornate crucifix with a large
ruby on the end. Like the Quietus and Bloodscourge, the Wraithverge needs to be assembled from different segments found throughout the
game.
The Wraithverge is the most destructive weapon in the
game. When fired, it shoots a sphere of spiritual energy which splits into four ghosts (wraiths) that rend and tear at enemies that get in their way. The ghosts can, however, be turned against the player if they
fire the Wraithverge at any monster that is in protect mode (The Heresiarch's reflective barrier, the mage's Icon of the Defender, and Centaur/Slaughtaur in shield stance before the ghosts split from the original projectile) or if they are repelled with a Disc of Repulsion. The Wraithverge is also the most
mana-consuming weapon in the
game, requiring
18 of each kind of mana.
Source: Doom Wiki