Bosses must be defeated in order to progress into the game's storyline and unlock the next mission. Defeating each boss awards the player with a quest completion, sometimes with rewards (e.g. defeating Dreadwing awards the processor).
Erchius Horror Edit
Main Article: Erchius Horror Edit
This is the game's first boss, fought at the Erchius Facility during the mission Lunar Base. Unlike other bosses, he is not directly attacked - the player must instead interact with levers around the room. It attacks by summoning enemies and firing erchius lasers.
This is the game's second boss, fought during the mission Dreadwing. It can also be summoned using the distress beacon (unable to obtain through regular gameplay). It consists of a penguin piloting a UFO which has a range of attacks and can spawn penguin enemies to attack the player. A shield is recommended.
Shockhopper MK I Edit
Main Article: Shockhopper MK I Edit
Giant Jelly Edit
Main Article: Giant Jelly Edit
This is the only pre-Upbeat Giraffe boss still in the game, summoned using the Peanut Butter Trap. As of now, this boss is purely optional as its drops do nothing.
The Bone dragon Edit
The bone dragon is a "removed" boss that can be summoned by typing /spawnmonster dragonboss after typing /admin
There is no known other way to summon it yet. It can drop 5 dragon bones, a dragon claw, and a codex titled "Bone Dragon".