Joseph's Wrath is the unique Mirror trait in the Joseph: Collapse DLC. It gives Joseph short buffs when his health is critically low, from seeing enemies through walls to shooting through them.
When Joseph is close to death, the trait kicks in. Depending on the level, he sees enemies through walls, takes less damage, moves and reloads faster, and can fire through walls. The top level makes these special abilities last longer.
Walk up to the Mirror in a safe house and spend Penance, the currency you earn in Joseph: Collapse. Levels unlock in order, and each one costs more than the one before.
It turns near-death moments into a chance to escape or turn the fight. Buy Pride first, though, since more health keeps you out of that danger zone.
Envy (Joseph)
Adds up to four gadget sockets to the weapon wheel.
Greed (Joseph)
Lets you keep more currency after dying, and at the top level recover your full inventory where you died.
Pride (Joseph)
Gives replenishing Healing Syringes, then raises maximum health in five steps.
Sloth (Joseph)
Adds syringe capacity, the Camera, the Wingsuit, Parachute and Grapple, faster crouch movement and vehicles at safe areas.