Nightmare Mangle is a boss in Slender Fortress.
Out of all the nightmare animatronics, Nightmare Mangle appears to be in the most disrepair. Overall, it appears to resemble the original Mangle, except for its endoskeleton parts, which are exposed more than any other nightmare animatronics. It possesses all of the original parts from Mangle, such as the plastic head, endoskeleton head, and various mechanical parts, but appears far more sinister and twisted, though not as much as Nightmare Balloon Boy. Its head shape looks similar to Nightmare Foxy's with added red cheeks and lipsticks, while the second endoskeleton head closely resembles a skull. Nightmare Mangle also has three endoskeleton legs, unlike Mangle, which has two endoskeleton legs and one endoskeleton arm that acts as a leg.
In Slender Fortress Edit
Nightmare Mangle is a instakillerlike the other animatronics, it can'tbe stunnable untill it has a few helpers, Nightmare Freddy, Nightmare Bonnie, Nightmare Chica, Nightmare Foxy, Nightmare Fredbear, Nightmare, Jack-O-Bonnie, Jack-O-Chica, Nightmare Balloon Boy, Plushtrap and Nightmarionne.