Littleneck is a boss that appears in The Nameless City. It is encountered through a secret in E3M8: As Above, So Below and appears as a smaller version of the Leatherneck.
Encounter
In one of the latter segments of E3M8, the player will walk into a room full of scaled-up props which prompts the Mysterious Voice will say to the player, "So small, so powerless...". After fighting off the enemies in that particular room, there is a wall that can be opened up, revealing a secret. Upon picking up the items in the secret area, another wall will open in front of the player, revealing Littleneck.
Tactical Analysis
Littleneck's behavior is identical to that of the Leatherneck, with a slight speed increase and a reduction in physical size. The boss has 2000 health, making it one of the easier bosses to fight in the game. Like the Leatherneck, Littleneck's attacks are all melee-oriented and cannot deal damage from a distance. As long as the player does not get too close to the boss's melee range, it can be easily defeated through continuous fire from an Assault Rifle or a few shots from a Riveter.