Skeletron Prime

Skeletron PrimeContraption of Dread

Statistics

Type	Boss
Environment	Surface
Life	50,000 (net total): 22,000 (arms) + 28,000 (head)
KB resist	100%

Drops

Coins	40

Map icon

Skeletron Prime is a Hardmode boss. Defeating it unlocks an array of new content, including the Solar Eclipse.

Spawn

Skeletron Prime can be summoned manually using a Mechanical Skull at night. It also has a 1/10 (10%) chance to spawn naturally at dusk once a Demon or Crimson Altar has been destroyed, as long as it has not yet been defeated at least once in the current world. If spawning this way, its arrival is announced by the status message "The air is getting colder around you...".

Behavior

Skeletron PrimePhase One

Statistics

Life	50,000 / 50,000 (total effective): 22,000 / 50,000 (arm collective) + 28,000 (head)
KB resist	100%

Map icon

Skeletron Prime spawns above the player and creates a shield. Its head cannot be damaged while its arms are alive. During this phase, it alternates between hovering above and below the player. The arms will perform attacks from the following set:

Cannon Shots

• The laser and cannon arms create telegraphs briefly before firing.
• The cannon arm fires 3 predictive missiles.
• The laser arm fires 1 predictive small laser.
• The arms will not fire if they are too close to the player.

Arm Charges

• The vice and saw arms stop moving and start telegraphing a charge.
• They perform a predictive charge, then return to their original positions relative to the player.
• Sometimes after the arms finish their predictive charge, they will begin performing desynced charges.
  • The arms can charge up to 5 times each before going back to their original positions again.

Slow Shrapnel Charge

• The vice and saw arm move into a cross position.
• The arms will begin accellerating downward till they reach their top speed.
• They will also move slowly in the direction of the player.
• As the arms move downward, they will release damaging sparks perpendicularly.

The first phase cycles through the following attack pattern:

• Cannon Shots
• Arm Charges or Slow Shrapnel Charge

Skeletron PrimePhase Two

Statistics

Life	28,000 / 28,000 (total)
KB resist	100%

Map icon

After defeating Skeletron Prime's arms, its shield will deactivate with a shockwave, making the head damageable. It gains an entirely new set of attacks for this phase which it cycles through at random.

Metal Burst

• Skeletron Prime flies above the player and hovers from side to side.
• While hovering above the player, it shoots 4 waves of spikes in circles.
• If the player is too close to Skeletron Prime, it will not fire projectiles.

Rocket Release

• Skeletron Prime will stop moving and sits stationary briefly.
• It will then begin firing waves homing missiles and skulls.

Hover Charges

• Skeletron Prime will move diagonally above the player, and charges at them.
• Upon charging, it releases a spread of 11 metal spikes.
• It will perform 4 charges.

Skeletron PrimePhase Two

Statistics

Life	11,200 / 28,000 (total)
KB resist	100%

Map icon

Skeletron Prime enters its third phase after its head reaches 40% (11,200) health, and adds 2 new abilities to its attack pool which it selects from at random.

Lightning Supercharge

• Skeletron Prime summons non damaging red lighting from the sky, then creates rotating telegraphs from its head.
• Radial deathrays will fire along these telegraphs, restricting the player's movement.
• Skeletron Prime will then fire rings of electric sparks and several missiles.

Tesla Mines

• Skeletron Prime will stop in place and summon Tesla Mines around the player.
• These mines will explode after a few seconds, leaving lightning clouds that will linger through the next attack.

Metal Burst

• Skeletron Prime flies above the player and hovers from side to side.
• While hovering above the player, it shoots 4 waves of spikes in circles.
• If the player is too close to Skeletron Prime, it will not fire projectiles.

Rocket Release

• Skeletron Prime will stop moving and sits stationary briefly.
• It will then begin firing waves homing missiles and skulls.

Hover Charges

• Skeletron Prime will move diagonally above the player, and charges at them.
• Upon charging, it releases a spread of 11 metal spikes.
• It will perform 4 charges.

Aftermath

• If the Early Hardmode Progression Rework option is enabled, new ores will be generated in the Underground and Cavern layers:
  • If Skeletron Prime is the first mechanical boss to be defeated, Mythril and Orichalcum Ore will be generated.
  • If Skeletron Prime is the second mechanical boss to be defeated, Adamantite and Titanium Ore will be generated.
  • If Skeletron Prime is the third mechanical boss to be defeated, Hallowed Ore will be generated in the Underground Hallow biome.
• The Bandit will begin selling the Momentum Capacitor if The Twins and The Destroyer have also been defeated.
• The Drunk Princess will begin selling Vodka, Screwdriver and White Wine if The Twins and The Destroyer have also been defeated.
• The Archmage will begin selling the Arctic Bear Paw, Frosty Flare, Cryophobia and Cryogenic Staff if The Twins and The Destroyer have also been defeated.

Tips

Achievement

Malicious Machinery • "Decommission the Maniacal Mechanical trio in one fell swoop!"

Beat Infernum Mecha-Mayhem

Trivia

• The soundtrack heard during the battle against Skeletron Prime is Inferior Fabrications, which was composed by the artist PinpinNeon.