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Jetshift Mod adds a collection of bosses into the game. Each boss has their own different behaviour, with each one being more difficult over the last.

Pre-Hardmode Bosses[]

These are the first bosses the player can encounter in Jetshift Mod.


Serperannus (Jetshift).png
Burrowing Down (Jetshift).png
Jungle Grub (Jetshift).png

Serperannus is a jungle snake with 10,000 HP (16,000 in Expert mode). She is summoned with Jungle Grub in the Underground Jungle. She behaves very similarly to other worms, burrowing through blocks and trying to hit the player once they turn around. However, after losing some health, she will send in 2 Exile's Underlings after the player and she becomes invincible until they die.

Torva-mes, The Grim Reaper[]

Torva-mes, The Grim Reaper (Jetshift).png
Immortality (Jetshift).png
Cursed Rune (Jetshift).png

Torva-mes, The Grim Reaper is a grim reaper with 2,950 HP (4,720 in Expert mode). It is summoned using a Cursed Rune in The Underworld. It indefinitely floats towards the player alongside his minion scythe. When Torva-Mes gets too close to the player, it will dash at incredible speed, making it difficult to dodge.


Viyilblud (Jetshift).png
Korupted Lend (Jetshift).png
Corrupted Shard (Jetshift).png

Viyilblud is the core of evil with 4,000 HP (5,450 in Expert mode, and 8,000 in Nightmare mode). He is summoned using a Corrupted Shard in the world's evil. He follows a strange movement and attack pattern and does not allow the player to flee. When the player teleports too far away from Viyilblud, such as by using a Magic Mirror or a Rod of Discord, he will teleport with them.

If Viyilblud is lured outside the world's evil, he will enrage and become invulnerable to all damage.

Possessor, Purgatory Incarnate[]

Possessor, Purgatory Incarnate (Jetshift).png
Nightmares Of Sorrow (Jetshift).png
Warphole Ring (Jetshift).png

Possessor is the purgatory incarnate with 3,000 HP (4,800 in Expert mode, and 10,204 in Nightmare mode). He is summoned with a Warphole Ring at night. He chases down the player throughout the fight while shooting Spirit Flames and Demon Scythes. He occasionally stops to fire a ring of ghastly projectiles.

If Possessor is not beaten by dawn, he will speed up to an incredible speed and instantly kill all players in the vicinity on contact.

Hardmode Bosses[]

Murus, Tower of Flames[]

Murus, Tower of Flames (Jetshift).png
The Depths of Hell (Jetshift).png
Cursed Wall (Jetshift).png

Murus, Tower of Flames is a tower of flames with low HP, but compensates by only taking damage by the death of his minions. It is summoned with a Cursed Wall in The Underworld.


Arlenon (Jetshift).png
Unheavenly Sight (Jetshift).png
Pearl of the Sky (Jetshift).png

Arlenon is the ruler of the sky with 30,000 HP (42,700 in Expert mode, and 70,800 in Nightmare mode). She is summoned with a Pearl of the Sky on a Floating Island. Arlenon acts in a way similar to Ice Queen, but instead of firing ice waves, she shoots Eye Beams. Just like the Ice Queen, her speed and attack rate increase as she loses HP. She also summons in Skyeyes.


Athazel (Jetshift).png
Dime Dropped (Jetshift).png
Trident of Doom (Jetshift).png

Athazel is a devil with 28,500 HP (32,900 in Expert mode, and 50,500 in Nightmare mode). She is summoned with a Trident of Doom in The Underworld. Athazel, just like Torva-mes, has her own unique behavior.

Shift, Defender of Space[]

Shift (Jetshift).png
Forbidden Gem (Jetshift).png

Shift, Defender of Space is a member of Crystal Conflict's army with ??? health (??? in Expert Mode). He is summoned with the Forbidden Gem anywhere at night. He mainly attacks by hovering towards the player, shooting projectiles, and sending his head and arms after the player.

Polypus, The Great Oceanic Beast[]

Polypus, The Great Oceanic Beast (Jetshift).png
Deep Sea Challenger (Jetshift).png
Contaminated Rotten Shrimp (Jetshift).png

Polypus, The Great Oceanic Beast is a large octopus with 33,500 HP (53,600 in Expert mode). She is summoned with a Contaminated Rotten Shrimp in the Sunken Isles. Polypus slowly chases after the player, shooting projectiles and summoning minions to help her.

Post Moon Lord Bosses[]

These bosses can only be fought after defeating the Moon Lord for the first time within any given world. These bosses are the most difficult, and should be planned carefully before taking them on.


Oculus (Jetshift).png
Sight Not Worth Seeing (Jetshift).png
Mechanical Eye MK2 (Jetshift).png

Oculus is an amalgamation of the Mechanical Bosses with 190,000 HP (294,500 HP in Expert Mode). It is summoned with the Mechanical Eye MK2 at night. It alternates between 4 AI patterns, all with different behaviors.

The Annihilation[]

The Annihilation (Jetshift).png
Oblivious (Jetshift).png
Pitch Blackness (Jetshift).png

The Annihilation is a giant worm lurking in the Great Darkness with 100,000 HP (160,000 in Expert mode). He is summoned with a Pitch Blackness in The Great Darkness. He moves at an incredible speed and instantly kills all players upon contact with his head (In Nightmare Mode only).

Frezyn, The Ancient Ice Dragon[]

Frezyn, The Ancient Ice Dragon (Jetshift).png
Cryogenic Crystal (Jetshift).png
Seal of Dragons (Jetshift).png

Frezyn, The Ancient Ice Dragon is an ancient ice dragon with 400,000 HP (600,000 in Expert mode and 1,000,000 in Nightmare Mode). He is summoned with the Seal of Dragons in the Snow biome. He behaves like a Wyvern but uses an ice breath attack in front of himself.


Mortalos (Jetshift).png
Oblivious (Jetshift).png
Seal of Demons (Jetshift).png

Mortalos is the last sinner in Hell with 134,800 HP (188,720 in Expert mode). He is summoned with the Seal of Demons in The Underworld. He is considered one of, if not the most difficult boss in the Jetshift Mod. He constantly follows the player while slamming down his fists and shooting long streams of fireballs. He is the only boss in the mod that requires a certain platform to be built before he can be fought.

If the player attempts to escape the fight with Mortalos by escaping the Underworld, his watchdog will swoop in and kill the player in an (almost) undodgable dash.


Crystal Wyrm[]

Crystal Wyrm (Jetshift).png

The Crystal Wyrm is a post Moon Lord miniboss. It spawns in Space, and requires its minions to be killed before it is defeated.

Boss Progression[]

Icon Name
King Slime.png King Slime
Eye of Cthulhu.png Eye of Cthulhu
Serperannus (Jetshift).png Serperannus
Eater of Worlds.png Brain of Cthulhu.png Eater of Worlds or Brain of Cthulhu
Torva-mes, The Grim Reaper (Jetshift).png Torva-mes
Queen Bee.png Queen Bee
Viyilblud (Jetshift).png Viyilblud
Skeletron.png Skeletron
Possessor, Purgatory Incarnate (Jetshift).png Possessor, Purgatory Incarnate
The Annihilation (Jetshift).png The Annihilation (1st fight)
Wall of Flesh.png Wall of Flesh
Icon Name
Murus, Tower of Flames (Jetshift).png Murus, Tower of Flames
Skeletron Prime.png The Twins.png The Destroyer.png Arlenon (Jetshift).png Mechanical Bosses and Arlenon
Athazel (Jetshift).png Athazel
The Annihilation (Jetshift).png The Annihilation (2nd fight)
Shift (Jetshift).png Shift
Plantera.png Plantera
Golem.png Golem
Duke Fishron.png Duke Fishron
Polypus, The Great Oceanic Beast (Jetshift).png Polypus
Lunatic Cultist.png Lunatic Cultist
Moon Lord.png Moon Lord
Post-Moon Lord
Icon Name
Oculus (Jetshift).png Oculus
The Annihilation (Jetshift).png The Annihilation (3rd fight)
Frezyn, The Ancient Ice Dragon (Jetshift).png Mortalos (Jetshift).png Mortalos and Frezyn
Serpent's Greatblade (Jetshift).png Weapons • Serpent's Helmet (Jetshift).png Armor • Heart of Acceptance (Jetshift).png Accessories • Unstable Pickaxe (Jetshift).png Tools • Hell Brick (Jetshift).png Blocks • Astral Destabiliser (Jetshift).png Furniture • Unstable Fragment (Jetshift).png Crafting materials • Legendary Scroll (Jetshift).png Miscellaneous
Cursed Rune (Jetshift).png Mechanics ( Cursed Wall (Jetshift).png Achievements • Shift (buff) (Jetshift).png Buffs )
Quaker (Jetshift).png NPCs ( Wall Clinger (Jetshift).png Enemies • Wordsmith Map Icon (Jetshift).png Town NPCs • Unstable Cosmic Star (Jetshift).png Minibosses • Shadowflight Dagger (Jetshift).png Bosses)
Dark Snow (Jetshift).png Biomes