Nightmare Slime Man is the Nightmare Version of Slime Man, and is a fan made antagonist in Abandoned Discovery Island.
He is the same as Slime Man, but except that he has some fleshy sword's in his hands, but are blue.
Nightmare Slime Man's Behavior is way different than the original Slime Man, and is much bigger. He will start in the Janitor's Closet in Night 7, which is one more night when the original Slime Man appears. Then he will move to the Bathrooms, close to the toilet. And then he teleports to Character Prep 1, laying down for a bit with Photo-Negative Mickey and Disembodied. Then he will stand up and move to the Staff Area, looking at the player like the normal Slime Man. Then he will move to the Meat Freezer, holding the cleaver for a bit, then goes to the Lounge, and then the final location, which is the office. Same as the normal Slime Man + Undying, you need to shut off the power to survive, or else Nightmare Slime Man will kill the player with blue fleshy swords. Hiding has a 5% chance of working too. Shutting off a camera will never work on him.
- He is the normal Nightmare Undying from NBD, but he is blue.
- His jumpscare is the same as Nightmare Undying's Jumpscare, but is blue, again.
- He is one of TheDeadBody's characters, that have the longest behavior sections. Nightmare Slime Man has the most!
- He can rarely appear in other nights too, with a 2% chance.