Skeletron Prime

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Skeletron Prime
Skeletron Prime.png
Statistics
Type Boss
AI Type Skeletron Prime Head AI
Damage 47 / 79 Desktop only.png
94 / 158 Desktop only.png (while spinning)
Max Life 28000 / 42000 Desktop only.png
Defense 24
48 (while spinning)
KB Resist 100%
Immune to: Confused.pngPoisoned.pngVenom.pngOn Fire!.pngCursed Inferno.pngShadowflame.pngDaybroken.pngPenetrated.pngCelled.png
Drops
Coins 12 Gold Coin
Item (Quantity) Rate
Soul of Fright.png Soul of Fright 
• 20-40 / 25-40 Desktop only.png
100%
Greater Healing Potion.png Greater Healing Potion 
• 5-15
100%
Hallowed Bar.png Hallowed Bar 
• 15-30 / 20-35 Desktop only.png
100%
Skeletron Prime Mask.png Skeletron Prime Mask 
14.29%
Skeletron Prime Trophy.png Skeletron Prime Trophy 
10%
Horned God Mask.png Horned God Headpiece 
Console only.png
14.29%
Treasure Bag (Skeletron Prime).png Treasure Bag
(Skeletron Prime)
 Desktop only.png
• in Expert Mode only
100% Desktop only.png

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 only.png) or "You feel the air getting colder around you..." (Console only.png Mobile only.png).

The boss music is Boss 1.

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
Statistics
Type Enemy
AI Type Prime Cannon AI
Damage 40 (grenade)
30 / 51 Desktop only.png (melee)
Max Life 7000 / 10500 Desktop only.png
Defense 23
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 128
Prime Laser
Prime Laser.png
Statistics
Type Enemy
AI Type Prime Laser AI
Damage 50 / 100 Desktop only.png (death laser)
29 / 49 Desktop only.png (melee)
Max Life 6000 / 9000 Desktop only.png
Defense 20
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 131
Prime Vice
Prime Vice.png
Statistics
Type Enemy
AI Type Prime Vice AI
Damage 52 / 88 Desktop only.png
Max Life 9000 / 13500 Desktop only.png
Defense 34
KB Resist 100%
Immune to: Poisoned.pngVenom.pngOn Fire!.pngConfused.png
Internal NPC ID: 130
Prime Saw
Prime Saw.png
Statistics
Type Enemy
AI Type Prime Saw AI
Damage 56 / 95 Desktop only.png
Max Life 9000 / 13500 Desktop only.png
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 only.png
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 only.png
Achievement Bona Fide.png Bona Fide"You have defeated Skeletron Prime!"
Defeat Skeletron Prime for the first time. Console only.png

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.
  • Skeletron Prime's arms are not immune to the Cursed Inferno, Penetrated, Celled and Daybroken debuffs. However, its head is immune.
  • Skeletron Prime can be defeated by only killing its head.
  • 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 and Ichor debuffs.
  • Skeletron Prime is the only Mechanical Boss without the word 'The' in it's name.

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.
  • 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, so Skeletron Prime's head will not have anything blocking it, which will make the fight a lot easier though it does give you less time to defeat Skeletron Prime's head.

See also[edit | edit source]

History[edit | edit source]

For changes that affect all the mechanical bosses, see Mechanical_Bosses#History.
Characters: Blue Slime.png Pre-Hardmode Enemies • Pixie.png Hardmode Enemies • Goblin Warrior.png Event Enemies • Skeletron Head.png Bosses
Bunny.png Critters • Guide.png Friendly NPCs • Baby Dinosaur.png Familiars