|Signs of nearing||Undyne's voice|
Undyne is a boss on Slender Fortress, has two Content Downloaders.
Undyne is a fish-like humanoid undine monster. She has blue scales and a long bright red ponytail. She appears to not have a nose, she has red and blue fins on the side of her head, and a pair of sharp yellow protruding teeth. She wears bright red eye shadow and has an eyepatch on her left eye. Her eyes have vertical black pupils and a yellow sclera.