Skeletron Prime

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Skeletron Prime
Skeletron Prime.png
Type Boss
AI Type Skeletron Prime Head AI
Damage 47 / 79
94 / 158 (while spinning)
Max Life 28000 / 42000
Defense 24
48 (while spinning)
KB Resist 100%
Coins 12 Gold Coin
Item (Quantity) Rate
Soul of Fright.png Soul of Fright
• 20-40
Greater Healing Potion.png Greater Healing Potion
• 5-15
Hallowed Bar.png Hallowed Bar
• 15-30
Skeletron Prime Mask.png Skeletron Prime Mask
Skeletron Prime Trophy.png Skeletron Prime Trophy
Horned God Mask.png Horned God Headpiece
Console only.png
Treasure Bag (Skeletron Prime).png Treasure Bag (Skeletron Prime)
• in Expert Mode only Pc only.png
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 chat message, "You feel the air getting colder around you" or "The air is getting colder around you".

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 act like The Twins when they are charging, but the Prime Laser acts like Retinazer And Wall Of Flesh while they're 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.

Arms[edit | edit source]

Prime Cannon
Prime Cannon.png
Type Enemy
AI Type Prime Cannon AI
Damage 40 (grenade)
30 / 51 (melee)
Max Life 7000 / 10500
Defense 23
KB Resist 100%
Internal NPC ID: 128
Prime Laser
Prime Laser.png
Type Enemy
AI Type Prime Laser AI
Damage 50 / 100 (death laser)
29 / 49 (melee)
Max Life 6000 / 9000
Defense 20
KB Resist 100%
Internal NPC ID: 131
Prime Vice
Prime Vice.png
Type Enemy
AI Type Prime Vice AI
Damage 52 / 88
Max Life 9000 / 13500
Defense 34
KB Resist 100%
Internal NPC ID: 130
Prime Saw
Prime Saw.png
Type Enemy
AI Type Prime Saw AI
Damage 56 / 95
Max Life 9000 / 13500
Defense 38
KB Resist 100%
Internal NPC ID: 129

Achievements[edit | edit source]

Achievement Buckets of Bolts.png Buckets of Bolts
Defeat all three Mechanical Bosses. Pc only.png
Achievement Mecha Mayhem.png Mecha Mayhem
Defeat all three Mechanical Bosses simultaneously in a single battle. Pc only.png
Achievement Bona Fide.png Bona Fide
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 its 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 debuff, however, its head is.
  • Skeletron Prime can be defeated by only killing its head.
  • If the player summons Skeletron Prime in space, he will leave almost instantly.

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.

See also[edit | edit source]

History[edit | edit source]

  • Added Expert Mode drop, Mechanical Battery Piece.
  • 1.2.3: Increased health, damage and defense of most parts. May now drop Skeletron Prime Mask. Fixed bug where you can kill Skeletron Prime if you destroy the Prime Cannon hand and not Skeletron Prime itself.
  • 1.2:
    • Now has a chance to spawn during hardmode with the message: "You feel the air getting colder around you...".
    • Will now drop 20-40 Souls of Fright, instead of 20-30. Also has a chance to drop Skeletron Prime Trophy.
    • Health, damage and defense of all parts and head reduced.
    • Now does not act similarly to dungeon guardian when dawn arrives.
  • 1.1: Introduced.
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