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, "The air is getting colder around you..." (Desktop VersionConsole version) or "You feel the air 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 into 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 having 9999 defense. During this time, it travels at a speed of 65 mph.

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

Trivia[edit | edit source]

  • Skeletron Prime will open and shut its mouth for the entire battle. This, however, has no effect in battle.

Notes[edit | edit source]

  • The Bombs fired by the Prime Cannon will only detonate if they hit solid Blocks (they will not destroy Blocks). They will pass through Platforms without detonating.
  • If the player is deep enough underground, Skeletron Prime will not spawn randomly, even when the chat message indicates it's coming.
  • Unlike Skeletron, Skeletron Prime's defense doubles when its head is spinning.
  • Only Skeletron Prime's "head" is immune to the Cursed Inferno, Penetrated, Celled, and Daybroken Debuffs. Its "arms," however, are not.
  • The head of the Skeletron Prime is immune to most damage-inflicting Debuffs. Those it is not are Frostburn, Betsy's Curse, and Ichor Debuffs, giving players with a world with The Crimson at an advantage over worlds with The Corruption.
  • Like the Skeletron, Skeletron Prime can be defeated during the day, however, it is significantly more difficult.

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.
  • Skeletron Prime can be the most profitable boss in the game, as the Souls of Fright can be crafted into Naughty Present to summon the Frost Moon, netting large amounts of money per 5 souls, as well as Hallowed Bars at the same time to make a Pumpkin Moon Medallion to start the Pumpkin moon.
  • A tall arena may be more advantageous because it allows the player to flee upwards. This can be useful when Skeletron Prime performs its spin attack, allowing the player to get rid of any arms giving them trouble.
  • Try killing off its four arms. That way Skeletron Prime's head will not have anything blocking it, which will make the fight a lot easier. Although, this gives you less time to defeat Skeletron Prime's head, it is usually worth it.
  • If you have obtained Wings, then when Skeletron Prime's headspin occurs, you can move away quicker and will allow you to get more hits off on it.
  • Alternatively, make a skybridge like the one recommended when fighting The Twins, and run back and forth, shooting from a safe distance. This is a little difficult, but may be easier to do in some circumstances, in comparison to building a vertical arena.
  • Using Frost armor is recommended due to Prime not being resistant to the Frostburn debuff.

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.
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