Batman Arkham Origins (Nightmare) Mask

As the shadowy vigilante of DC Comics' Gotham City, Batman, uses fear as his ultimate weapon, in his early days, criminals typically viewed the enigmatic and unstoppable crime fighter as a tenebrous moth-like demon, and somehow, this interpretation of the Dark Knight.

Nightmare Batman is a Boss in Boss Pack 4 & the Hit & Run Pack. Batman uses his ability to teleport behind you combined with his rather quiet sounds to ambush people. He's very fast, but he doesn't stay on your back for as long as most Hit & Runs. He has 3 attacks: 2 attacks do rather low damage, and his smokescreen attack deals much higher damage than the others.