Phantom Mangle is a boss in Slender Fortress.
Phantom Mangle looks much like Mangle did in the second game, but with a burnt appearance, possibly foreshadowing the fire that broke out in the establishment. It lacks eyes and instead has pin-pricked, white irises. Phantom Mangle seems to have half of its left eye missing although it could just be obscured by something else. Phantom Mangle appears exclusively on CAM 04 and, when it appears in The Office, it will be behind the window and to the left. Phantom Mangle only appears from Night 2 onward, as do all the other phantoms.
In Slender Fortress Edit
Phantom Mangle cannot instakill you but it steals your audiomaker, a few Phantom Animatronics has the only helper that CAN instakill you called, Springtrap.