Skeletron Prime

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Skeletron Prime
Skeletron Prime.png Old-gen Console, Mobile, 3DS versions
Type Boss
AI Type Skeletron Prime Head AI
Damage 47 / 79 Desktop VersionConsole Version
94 / 158 Desktop VersionConsole Version (while spinning)
Max Life 28000 / 42000 Desktop VersionConsole Version
Defense 24
48 (while spinning)
KB Resist 100%
Immune to: Confused.pngPoisoned.pngVenom.pngOn Fire!.pngCursed Inferno.pngShadowflame.pngStardust Dragon.pngDistorted.pngStardust Cell.png
Coins 12 Gold Coin
Item (Quantity) Rate
Soul of Fright.png
Soul of Fright 
• 20-40 / 25-40 Desktop VersionConsole Version
Greater Healing Potion.png
Hallowed Bar.png
Hallowed Bar 
• 15-30 / 20-35 Desktop VersionConsole Version
Skeletron Prime Mask.png
Skeletron Prime Trophy.png
Horned God Mask.png
Horned God Mask Console VersionOld-gen console version
• (Old-gen console version)
Treasure Bag (Skeletron Prime).png
100% Desktop VersionConsole Version

Map Icon Skeletron Prime.png
Map Icon
Internal NPC ID: 127
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, dealing enough damage to kill most players in a single hit and having 9999 defense, acting like a Dungeon Guardian.

Arms[edit | edit source]

Prime Cannon
Prime Cannon.png
Type Boss Part
AI Type Prime Cannon AI
Damage 40 (grenade)
30 / 51 Desktop VersionConsole Version (melee)
Max Life 7000 / 10500 Desktop VersionConsole Version
Defense 23
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 128
Prime Laser
Prime Laser.png
Type Boss Part
AI Type Prime Laser AI
Damage 50 / 100 Desktop VersionConsole Version (death laser)
29 / 49 Desktop VersionConsole Version (melee)
Max Life 6000 / 9000 Desktop VersionConsole Version
Defense 20
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 131
Prime Vice
Prime Vice.png
Type Boss Part
AI Type Prime Vice AI
Damage 52 / 88 Desktop VersionConsole Version
Max Life 9000 / 13500 Desktop VersionConsole Version
Defense 34
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 130
Prime Saw
Prime Saw.png
Type Boss Part
AI Type Prime Saw AI
Damage 56 / 95 Desktop VersionConsole Version
Max Life 9000 / 13500 Desktop VersionConsole Version
Defense 38
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 129

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 not destroy blocks). They 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.
  • If the player summons Skeletron Prime in space or forces him there, he will despawn almost instantly.
  • The head of the Skeletron Prime is immune to most of the debuffs, except the Frostburn, Betsy's Curse, and Ichor debuffs.
  • Skeletron Prime is the only Mechanical Boss without a definite article in its name.
  • Like the Dungeon Guardian, Skeletron Prime can be defeated during the morning. However, it would take a very long amount of time.

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.

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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