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Bosses are very powerful enemies that require skill and strategy to defeat. They come in two types: mission Bosses and side Bosses.

Mission Bosses

Mission Bosses are sometimes found at the end of quests and key story points in the game. These bosses include the Dreadwing the Penguin, the Erchius Horror, Ixodoom, and the Shockhopper MK I. They will sometimes drop books for the codex that give information on them.

Erchius Horror

Erchius Horror is found in the Erchius Mining Facility mission. It spreads damaging beams of energy around it, one at first, then two after it's been shot once. It also spawns a Moontant after each beam phase.

Players must activate switches around the boss to power a plasma cannon. Being struck with the cannon will cause the crystal to crack and shards will fall to the ground. After three shots the boss will be defeated, allowing players to complete the mission.

Fighting Strategy: Use a shield or blocking weapon, as well as tech or some form of movement booster that allows you to dodge the laser beams effectively. Also watch out for falling from the top from fall damage.
Drops : Erchius Eye (10%), Figurine (5%)
Minions : Moontant
Crystal Boss.gif


Fought in the Ceremonial Hunting Caverns mission.

It first appears as an egg when you encounter it and then hatches into its main form. It appears as a giant, four-legged creature made of bone and muscle. The player fights this boss with Nuru.

Fighting Strategy: Ixodoom fires small shots in a horizontal line that can be dodged. Use ranged weapons to break its shell so it can be attacked easily. When its shell is broken, it is paralyzed for a few seconds for you to deal large amounts of damage. Bring some sort of a leg tech, such as the Pulse Jump to deal lots of damage in its paralyzed state.
Drops : Ixodoom Claw (10%), Figurine (5%)
Minions : Ixoling

Asra Nox

Fought in the Great Pagoda Library mission.

Asra Nox appears at the end of the Hylotl mission. She has an energy shield, can turn into a Distortion Sphere and has a powerful sword known as the Solus Katana

Fighting Strategy: Memorize her attack pattern, as it is almost exactly the same every time. After the Distortion Sphere attack, she will rest for a few seconds, allowing you to deal damage.
Drops : Solus Katana (10%), Figurine (5%)
Asra Nox Boss.gif

Kluex Avatar

Fought in the Great Sovereign Temple mission.

The Kluex Avatar appears at the end of the Avian mission. It fires powerful laser blasts and can summon ice pillars. It also is able to create lava.

Fighting Strategy: Avoid the spheres and projectiles the boss spreads around the room, pay close attention to each phase and anticipate the attacks. After an initial stationary phase the boss will fly around the room, cycling the stages again while moving.
Drops : Kluex Staff (10%), Figurine (5%)
Kluex Avatar.gif

Big Ape

Fought in the Miniknog Stronghold mission.

Big Ape appears at the end of the Apex mission. It fires powerful laser blasts and explosives.

Fighting Strategy: Look for the gaps in the patterns of his attacks and damage projectors, every time a projector is destroyed Big Ape unleashes a plasma barrage which is very difficult to dodge.
Drops : Miniknog Launcher (10%), Figurine (5%)
Big Ape.gif

Bone Dragon

Fought in the Baron's Keep mission.

The Bone Dragon appears at the end of the Glitch mission. It breathes fire at the player and Occasus cultists also spawn to hinder the player

Fighting Strategy: Avoid the cone of fire breath the dragon fires. Also try to direct it so you don't have to cross through the fire it leaves on the ground.
Drops : Dragonhead Pistol (10%), Figurine (5%)
Bone Dragon.png

The Ruin

Fought in the final mission.

The Ruin, or The Heart of Ruin, appears at the end of the final mission after opening the gate at the ark. It flails giant tentacles, fires powerful cone lasers from its eye and summons monsters to fight alongside it.

Fighting Strategy: The Ruin has 3 main attacks. The first attack he will dish out is a cone of pure energy from his eye that will do massive amounts of damage if he lands it. The second attack consists of him spawning tentacles from the left and right side that will require movement towards the center of the fight. The third attack contains a teleport. He will open up his eye into another dimension and launch small balls in a random location. Dodge these. While the fight is going on, make sure to kill the minions on the ground and keep moving. Movement is key.
Minions : Misc Unique Monsters
The Ruin.png

Mini Bosses

Dreadwing the Penguin

Encountered in the Dreadwing mission, given by the penguin at the penguin bar at the outpost.

It appears as a giant flying saucers piloted by a penguin. It spawns penguin soldiers, tanks, and mini saucers. It attacks by shooting laser beams that can break blocks or slamming itself onto the ground.

This boss was first revealed in public stream at Insomnia Gaming Festival[1]

Fighting Strategy: Jumping sideways when the ship drops down is key, attacking while it is low on the ground. A ranged weapon is very helpful in this encounter since the boss is flying.
Drops : Codex
Minions : Penguin, Penguin Tank, and Penguin Mini Ufo
Penguin UFO.png

Shockhopper MK I

Shockhopper MK I is a mini-boss encounted in the quest Penguin Weaponry Testing Site, given by Dr. Akaggy in the outpost.

After he's defeated the shop will open up, offering weapons for sale.

Fighting Strategy: The boss uses melee attacks, missiles a ranged flamethrower and electric balls. Try to keep from staying too close and use walls to protect from flamethrower damage, hide from the balls when he does his AOE and shoot/slash missiles to reduce damage. It is recommended you bring the Spike Sphere , to help with the spiral electricity ball stage.
Drops : Codex
Shockhopper MK I.gif

Vault Guardians

A variation of a Vault Guardian

See also: Ancient Vault.

Vault Guradians are procedurally generated bosses found at the end of every Vault. A Vault Guardian is associated with one of the four types of elemental damage (fire, poison, ice or electric) which means it will take 50% less damage from its respective element weapons. It has its own name reminiscent of ancient Greece. These bosses are immune to all status effects. After defeating an Ancient Guardian it drops 1250 essence and has a 50% chance to drop a random microformer.

As Vault Guardians are procedurally generated there's no universal strategy for defeating them. However, it's good to have a non-elemental weapon (the Asuterosaberu_DX and Ex Machina work well) or weapons of all elements to minimize the chance of bringing a low-effective weapon or even maximize the chance of bringing the high-effective one (an Adaptable crossbow is useful here). A Guardian's element is recognized by its glowing parts (orange is for fire, green for poison, blue for ice and purple for electric).

Due to their procedural generation, each one is different, though they draw their attacks from a pool. Shielded Guardians will have some way of momentarily disabling the shield. Non-shielded Guardians will either have very high health or very high defense, and the latter will have a way for you to apply a special damage buff to more effectively damage them.

The following attacks have been observed. Names are not official. If anyone has better/the official ones, please replace the names below.

  • Jab: The Guardian winds up for a jab with its sword and lunges at the player. This can be a series of short jabs or one long-distance lunge. The way to avoid this is to keep moving, and use either the Sprint tech or the Blink Dash. During the multi jab, sprint back and forth, and if you must turn around, run past it between attacks. It does not deal contact damage, and jumping over it will simply get you hit.
It should be noted that the long lunge seems to only be done by shielded bosses that have two short energy spikes in their arena. This is the key to disabling the shield, as you must get them to slam into a spike. The spikes don't harm players at all. Sometimes, the Guardian does a sweeping attack where it goes to one side of the floor and lunges across the whole arena, slamming into the opposite wall. A Pulse or Multi Jump can easily dodge this.
  • Orbs: The Guardian creates large, glasslike orbs that travel horizontally at the height of any platforms around the arena. This is done to force the player off them or to set up an attack similar to the Kluex Avatar's lava attack. When this is being set up, it is done so in a way that forces the player to regularly change platforms to avoid damage.
  • Lava/Poison: After placing orbs, the Guardian fills the arena with either bright lava or poison. Only Fire and Poison Guardians have been observed to do this. The player must use the platforms or the Spike Sphere to avoid damage. The lava or poison only goes a tile or two high.
  • Spawn Constructs: The Guardian places two tiny purple orbs, which become a tethered pair of constructs once both are placed. One is a stationary sentinel, and the other is a fish-shaped floating construct that slowly pursues the player. If one is killed, the other disappears, however, if they meet, they fuse into a larger fish-shaped construct. If the Guardian that spawned them is a non-shielded Guardian with high defense, the fused construct will spawn a special damage boost zone when destroyed, allowing the player to deal more substantial damage to the Guardian. If it is shielded, the fused construct will immediately turn into a small purple orb with a pointer, similar to the Kluex Avatar or Kluex Staff's projectiles, and fire at the player after a short delay. The projectile will disable the Guardian's shield, allowing it to be damaged.
  • Spawn Construct Turrets: The Guardian places two orbs, like when it spawns tethered constructs, but the resultant 'fish constructs' have a squarer face and shoot a small series of blue orbs in bursts. Destroying them as soon as possible would be the best idea for the player.
  • Spawn Construct Breakers: The Guardian places 4 orbs, that turns into 'bird constructs' that have a pointed face. These do not shoot and follow the player around the field. The player must defeat these to get a 'damage boost' status boost to effectively attack the guardian with buffed defense.
  • Reflected Laser: The Guardian charges and fires a laser that reflects around the arena, aiming for the player. It does not change its aim once it fires. The beam reflects instantly, and the safe zones will be above or below where the player was when the laser was fired.
  • Sweeping Laser: The Guardian fires a laser at the player for a short time, changing its aim to follow the player. Keep moving to avoid this.
  • Alternating Lasers: The Guardian moves to one side of the arena and shoots blue lasers from it's hands that sweep up and down. It's always in the lower section of the room, and the highest point is slightly above the height of the Guardian, so the best strategy is to either get above him on a platform or stand next to him for half damage (his hands are staggered - one is more forward than the other, so less damage can be taken if the player waits behind the one hand).
  • Spinning Lasers: The Guardian fires short, continuous lasers from it's hands and spins them around it's body, following the player. The best method of avoidance is to stand on top of the Guardian (in between the lazers) or run continuously.
  • Projectile Spray: The Guardian fires a spray of small, round projectiles at the player. Fire Guardians' projectiles may explode after a short time. Use platforms and keep moving to avoid this.

Some arenas also have a pair of switches, each of which briefly activates a long spike of energy. This spike will break the Guardian's shield, allowing the player to attack it.

One Guardian has no shield but spawns chasing 'constructs' that must be defeated to spawn a 'damage boost' zone that disappears after the fourth has fallen.

There may be more attacks/arena strategies not listed here. If you see one, please add it.