Wraith Staff

The Wraith Staff is a Hardmode summon weapon obtainable before the Mech Bosses. It summons a friendly wraith to fight for the player, its AI is identical to a normal wraith, but attacks enemies instead of NPCs/Players.

Crafting
at a Mythril Anvil.
 * 15 Souls of Fright
 * 5 Souls of Unbright
 * 8 Hallowed Bars
 * 5 Souls of Night

Tips
If the player fights Skeletron Prime first to get the staff, they could kill the Destroyer and Twins pretty easily.