The Metal Parasite

The Metal Parasite is a blob-shaped enemy with the Metal Cap texture that can appear in Hazy Maze Cave and Cavern of the Metal Cap. When touched, the player will get the Metal Cap ability, though their health will steadily decrease, and the player will not be immune to enemy damage, and cannot instantly kill enemies. It only wears off when the player runs straight into a wall, and the Metal Parasite will be knocked off of the player. It is believed this is a cut alternative for the Metal Cap.