This article is a Pre-Hardmode bosses[ | ]
- Summoned with an
Infested Carcass or by breaking 3 Snot Orbs
Music: Bacterium Prime
For elaborate strategies on defeating Bacterium Prime, including weapon and arena recommendations, see Guide:Bacterium Prime strategies
Bacterium Prime is a large, flying bacteria with 1,500 health. It awakens after every third Snot Orb that is broken or after an Infested Carcass is used. Snot Orbs are found in the Contagion rings' chasms, surrounded by Chunkstone, which requires a pickaxe with 60% pickaxe power or higher to mine, although explosives or Purification Powder may be used to bypass this. Once within range, Snot Orbs can be destroyed with a hammer or explosives. Bacterium Prime can only be summoned in the Contagion, but at any time of day.
Bacterium Prime has two forms. In the first form, it can be hit, though all attacks will not inflict damage, and Bactus Minions will float around it. If the main boss is hit 12 times, a new Bactus Minion will spawn. After all of the minions are killed, Bacterium Prime will go into its second form, where it will teleport more frantically and move a lot faster, so a ranged weapon may be needed. Bacterium Prime's second attack form is ramming, like the second form of Eye of Cthulhu. Unlike most other bosses, Bacterium is not immune to knockback.
Bacterium Prime is the only source of Boogers in the game (other than the Bactus Minions spawned while fighting it), and drops a large amount of Baccilite Ore, which are their equivalents to the Corruption items Shadow Scale and Demonite Ore, and the Crimson items Tissue Sample and Crimtane Ore, respectively.
- Summoned with The Beak
Music: Desert Beak
For elaborate strategies on defeating Desert Beak, including weapon and arena recommendations, see Guide:Desert Beak strategies
Desert Beak is a large Vulture with 3,500 health. It is summoned using The Beak. It attacks by flying around the player, firing bombs and charging. If the player is above the boss, it enrages, becoming invulnerable and shooting a powerful laser.
Desert Beak is the only source of Desert Feathers in the game, and drops large amounts of Osmium/Rhodium/Iridium Ore, depending on which one is generated in the world.
Hardmode bosses[ | ]
- Summoned with an Ectoplasmic Beacon
Music: ? File:Music-?.mp3
Exxo Avalon/Phantasm Trophy For elaborate strategies on defeating Phantasm, including weapon and arena recommendations, see Guide:Phantasm strategies
Phantasm is a large underworld spirit with 45,000 health. It is summoned using an Ectoplasmic Beacon in the Hellcastle. In its first phase, it will hover above the player, firing a spread of Ghostflame projectiles, which can inflict the Shadow Curse debuff. Upon reaching 75% HP, it will relocate to the center of the Library of Knowledge inside the Hellcastle, and begin to fire sustained beam lasers in a sweeping pattern. After the boss falls below 2/3 HP, it will enrage, becoming immune to damage and firing a spiral spread of Ghostflame projectiles, which also inflict Shadow Curse. After this, Phantasm will become vulnerable again, and fire four sustained beam lasers at the player in a sweeping pattern. It will continue this phase until killed.
Phantasm drops 3-5 Ghost in the Machines, which are used to craft Hellbound Remote and phantom-themed items.
- Summoned by throwing a Hellbound Remote into lava
Music: ? File:Music-?.mp3
For elaborate strategies on defeating Wall of Steel, including weapon and arena recommendations, see Guide:Wall of Steel strategies
The Wall of Steel is a huge mechanical wall with 55,000 health. It is summoned by throwing a Hellbound Remote into a pool of lava in the Underworld. It is the final boss of Hardmode, because defeating it will irreversibly enable Superhardmode in the world.
It acts similarly to the Wall of Flesh, but instead of flesh-themed Hungry, it has Mechanical Hungry. When the boss is above 1/3 HP, it will fire spreads of Cursed Fireballs and lasers from the respective eyes. Once the boss falls below 1/3 HP, the center aperture will engage, firing a wide-beam, high damage laser every 3 seconds. During the firing of this laser, the Wall of Steel's defense drops to 0.
Wall of Steel drops a Dark Star Heart for each player in the world (upon its first defeat) and many Souls of Blight upon death.
Superhardmode bosses[ | ]
- Summoned with a Dark Matter Chunk
Music: Armageddon Slime
For elaborate strategies on defeating Armageddon Slime, including weapon and arena recommendations, see Guide:Armageddon Slime strategies
Armageddon Slime is a giant dark matter slime with 61,000 health. It is summoned using a Dark Matter Chunk. It behaves similarly to King Slime, jumping around and spawning Dark Mother Slimes when hit, while also shooting dark matter fireballs in all directions.
Armageddon Slime drops Dark Matter Soil upon death, allowing the player to create the Dark Matter Biome. Additionally, it allows Comets to land at midnight and causes more enemies appear in the Dungeon. It also allows specific pre-Hardmode and Hardmode bosses to spawn randomly on the player, and gives the player access to the /dawn and /dusk commands.
- Summoned with a Dragon Spine
Music: ? File:Music-?.mp3
For elaborate strategies on defeating Dragon Lord, including weapon and arena recommendations, see Guide:Dragon Lord strategies
Dragon Lord is a large, Wyvern-like dragon with 95,000 health. It is summoned using a Dragon Spine. It behaves similarly to wyverns, but will also summons meteors and fireballs, and breaths fire.
Dragon Lord drops Dragon Scales and various fire/dragon-themed weapons.
- Summoned with a Mechanical Wasp
Music: ? File:Music-?.mp3
For elaborate strategies on defeating Mechasting, including weapon and arena recommendations, see Guide:Mechasting strategies
Mechasting is a huge, mechanical wasp with 82,000 health. It is summoned using a Mechanical Wasp. It behaves by hovering around the player, spawning Stinger Probes and firing lasers, stingers, rockets and electric bolts.
Mechasting drops many Souls of Delight upon death.
- Summoned with an Eye of Oblivion
Music: ? File:Music-?.mp3
For elaborate strategies on defeating Oblivion, including weapon and arena recommendations, see Guide:Oblivion strategies
Oblivion is the final boss of Exxo Avalon mod. It is summoned using an Eye of Oblivion at night. Oblivion has 2 phases: 1st phase behaves similarly to Spazmatism and has 70,000 health, shooting dark matter fireballs and summoning World Feeders/Mechanical Diggers. Once dead, it transforms into it's final phase, that acts similarly to Skeletron Prime, except there are 2 heads: The purple-eyed one with 100,000 health and yellow-eyed one with 150,000 health. At half health, the purple-eyed head will spawn Astigmatazer and The Destroyer, and the yellow-eyed head will spawn Infernaspaz and The Twins.
Oblivion drops Souls of Torture, Victory Piece, Oblivion Ore, Acceleration Drill, Rhotuka Spinners, Tome of Luck and Curse of Oblivion upon death.
Boss Progression[ | ]
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Characters (List):  Pre-Hardmode Enemies •  Hardmode Enemies •  Superhardmode Enemies •  Event Enemies •  Bosses •  Friendly NPCs | |||||||||||||||||||||
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