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Skeletron Prime

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Skeletron Prime
Skeletron Prime.pngOld-gen Console, Mobile, 3DS versions
AI TypeSkeletron Prime Head AI
Damage47 / 79
94 / 158 (while spinning)
Max Life28000 / 42000
48 (while spinning)
KB Resist100%
Immune toPoisonedOn Fire!ConfusedCursed InfernoVenomShadowflamePenetratedCelledDaybroken
Coins 12 Gold Coin
Map Icon Skeletron Prime.png
Map Icon

Skeletron Prime Trophy.png "You feel the air getting colder around you..." Skeletron Prime Trophy.png

Not to be confused with Skeletron, the pre-Hardmode boss.

Skeletron Prime is a Hardmode Mechanical Boss which is essentially a harder version of Skeletron. It is summoned with the Mechanical Skull at night. Players have until dawn to defeat it. Skeletron Prime can also randomly spawn at dusk in Hardmode if it has not yet been defeated, in this case signaling its approach via the status message, "You feel the air getting colder around you..." (Desktop VersionConsole Version) or "The air is getting colder around you..." (Old-gen console versionMobile Version3DS Version).

The boss music is Boss 1, making this the only Mechanical Boss to share boss music with its Pre-Hardmode variant.

Attacks[edit | edit source]

Skeletron Prime has four limbs which are all immune to the Poisoned and On Fire! debuffs:

  • Prime Cannon fires bombs that do not destroy blocks, usually up into the air rather than directly at the player. It usually stays above the player.
  • Prime Laser shoots red Death Lasers similar to those of Retinazer and The Destroyer, and is always pointed at a player. It usually stays horizontal to the player.
  • Skeletron Prime's Prime Saw and Prime Vice both act similarly to the The Twins when they are charging, but the Prime Laser acts similarly to Retinazer or the Wall of Flesh while shooting laser beams.
    • Prime Saw usually remains under the player, then swipes upwards or downwards.
    • Prime Vice will swipe around wildly, making occasional lunges at the player. It usually remains diagonal to the player.

Skeletron Prime will occasionally enter a "Rage Mode," in which its attacks become more aggressive:

  • Skeletron Prime's Head will grow spikes and start spinning towards the player slowly. Damage and defense is doubled.
  • Prime Cannon will aim at the player directly and fire rapidly.
  • Prime Laser will fire more frequently.
  • Prime Saw will begin homing directly towards the player's location.
  • Prime Vice becomes more aggressive and frequently lunges towards the player.

Prime itself is much more mobile than its predecessor, and will regularly move off-screen, which can make it difficult to hit reliably with ranged weapons.

Like Skeletron, if it is not beaten by dawn it begins to continually headspin like a Dungeon Guardian, dealing enough damage to kill most players in a single hit and gaining 9999 defense. During this time, it travels at a speed of 65 mph. Skeletron Prime will still drop items if he is defeated this way.Verify

Arms[edit | edit source]

Prime Cannon
Prime Cannon.png
TypeBoss Part
AI TypePrime Cannon AI
Damage30 / 51 (melee)
40 (grenade)
Max Life7000 / 10500
KB Resist100%
Immune toPoisonedOn Fire!ConfusedVenom
Prime Saw
Prime Saw.png
TypeBoss Part
AI TypePrime Saw AI
Damage56 / 95
Max Life9000 / 13500
KB Resist100%
Immune toPoisonedOn Fire!ConfusedVenom
Prime Vice
Prime Vice.png
TypeBoss Part
AI TypePrime Vice AI
Damage52 / 88
Max Life9000 / 13500
KB Resist100%
Immune toPoisonedOn Fire!ConfusedVenom
Prime Laser
Prime Laser.png
TypeBoss Part
AI TypePrime Laser AI
Damage29 / 49 (melee)
50 / 100 (death laser)
Max Life6000 / 9000
KB Resist100%
Immune toPoisonedOn Fire!ConfusedVenom

Achievements[edit | edit source]

Achievement Buckets of Bolts.png
Buckets of Bolts • "Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime."
Defeat all three Mechanical Bosses. Desktop VersionConsole Version
Achievement Mecha Mayhem.png
Mecha Mayhem • "Do battle against the Twins, the Destroyer, and Skeletron Prime simultaneously and emerge victorious."
Defeat all three Mechanical Bosses simultaneously in a single battle. Desktop VersionConsole Version
Achievement Bona Fide.png
Bona Fide • "You have defeated Skeletron Prime!"
Defeat Skeletron Prime for the first time. Old-gen console version

Notes[edit | edit source]

  • The bombs fired by the Prime Cannon will only detonate if they hit solid Blocks. They will pass through Platforms without detonating.
  • If the player is underground, Skeletron Prime will not spawn randomly.
  • Unlike Skeletron, Skeletron Prime's defense doubles when its head is spinning.
  • Skeletron Prime's head is immune to the Cursed Inferno, Penetrated, Celled, and Daybroken debuffs. Its arms, however, are not.
  • The head of Skeletron Prime is immune to most damage-inflicting debuffs. However, it is susceptible to Frostburn and Ichor, giving players with a world with The Crimson at an advantage over worlds with The Corruption for this boss fight.

Tips[edit | edit source]

For more elaborate strategies on defeating Skeletron Prime, including Weapon and Arena recommendations, see Guide:Skeletron Prime strategies.

  • Standing on platforms far from blocks can mostly nullify the effects of the Prime Cannon, as its projectiles only detonate on blocks, while passing through platforms harmlessly.
  • Unhindered movement is crucial when Skeletron Prime's head starts spinning, as it deals double the regular damage. Wings greatly aid in moving vertically, and flattened terrain or a Sky Bridge are convenient for horizontal movement.
  • Although it is a little more time-consuming, focus on the arms first. Once Skeletron Prime's head is no longer shielded by anything, the fight gets a lot easier.
  • Using Ichor weapons can be effective because of his high defense, however, it's best to switch to the Ichor Weapon then switch back again quickly, as they don't deal that much damage.

Trivia[edit | edit source]

  • Skeletron Prime will open and shut its mouth for the entire battle. This is a purely cosmetic effect.

See also[edit | edit source]

History[edit | edit source]

For changes that affect all the mechanical bosses, see Mechanical Bosses#History.
  • Desktop 1.2.3:
    • Increased health, damage and defense of most parts.
    • Now drops Skeletron Prime Mask.
    • Fixed bug where the player could defeat Skeletron Prime by destroying the Prime Cannon hand and not Skeletron Prime itself.