Skeletron Prime

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Skeletron Prime
Skeletron Prime.pngOld-gen console version and 3DS version
Map Icon Skeletron Prime.png
Map Icon
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Statistics
Type
Environment
AI TypeSkeletron Prime Head AI
Damage47/79/119
94158238 (while spinning) [1]
Max Life28000/42000/53550
Defense24
48 (while spinning) [1]
KB Resist100%
Immune toConfusedPoisonedPenetrated

Skeletron Prime Trophy.png"The air is 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 more difficult version of Skeletron. It consists of a head and four limbs, but, similar to Skeletron, only the head needs to be defeated to defeat the boss.

Skeletron Prime can be manually summoned using a Mechanical Skull at night. It can also spawn naturally upon dusk with a chance of 10% once a Demon or Crimson Altar has been smashed, as long as it has not yet been defeated in the current world. If spawning naturally, its arrival is announced by the status message: "The air is getting colder around you..." (Old-gen console version3DS version alternatively "You feel the air getting colder around you..."). If it is not defeated before dawn, it will behave much like a Dungeon Guardian, not using its limbs at all, and charging at the Player at extremely high speeds.

While Skeletron Prime is alive, the music Boss 1 will play. When Otherworldly music Desktop and Mobile versions is enabled, the track Boss 2 (Otherworldly) will play instead.

Arms[edit | edit source]

Prime Cannon
Prime Cannon.png
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Statistics
Type
Boss Part
Environment
AI TypePrime Cannon AI
Damage30/51/76 (melee)
80160240 (grenade) [2]
Max Life7000/10500/13387
Defense23
KB Resist100%
Immune toPoisonedConfused
Prime Saw
Prime Saw.png
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Statistics
Type
Boss Part
Environment
AI TypePrime Saw AI
Damage56/95/142
Max Life9000/13500/17212
Defense38
KB Resist100%
Immune toPoisonedConfused
Prime Vice
Prime Vice.png
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Statistics
Type
Boss Part
Environment
AI TypePrime Vice AI
Damage52/88/132
Max Life9000/13500/17212
Defense34
KB Resist100%
Immune toPoisonedConfused
Prime Laser
Prime Laser.png
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Statistics
Type
Boss Part
Environment
AI TypePrime Laser AI
Damage29/49/73 (melee)
50100150 (death laser) [3]
Max Life6000/9000/11475
Defense20
KB Resist100%
Immune toPoisonedConfused

Attacks[edit | edit source]

Skeletron Prime's four limbs all have unique attacks:

  • Prime Cannon fires Skeletron Bomb.gif bombs that do not destroy tiles[note 1], usually up into the air rather than directly at the player. It usually stays above the player.
  • Prime Saw usually remains under the player, moving up and down.
  • Prime Vice will swipe around wildly, making occasional lunges at the player. It usually remains diagonal to 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 will occasionally enter a "rage mode", in which its attacks become more aggressive:

  • Skeletron Prime's Head will grow spikes and start spinning towards the player quickly, exactly like how its pre-Hardmode counterpart Skeletron does. Damage and defense are doubled to 94 / 158 / 238 damage and 48 defense.[1] The spinning speed is increased in Expert Mode (to nearly the same speed as that of the Dungeon Guardian).
  • Prime Cannon will aim at the player directly and fire rapidly.
  • Prime Saw will begin homing directly towards the player's location.
  • Prime Vice becomes more aggressive and frequently lunges towards the player.
  • Prime Laser will fire lasers more frequently.
  • Skeletron Prime lets out a roar every time it enters rage mode.

Skeletron Prime is generally much more mobile than its predecessor Skeletron, and will regularly move off-screen. Like Skeletron, if it is not beaten by dawn, it will behave like a faster Dungeon Guardian, travelling at a speed of 65 instead of 41 MPH, and killing the player instantly if touched: its damage increases to 1000 and its defense raises up to 9999.[1] If defeated this way he will drop items normally.

Notes
  1. The bombs fired by Prime Cannon do destroy tiles in "for the worthy" worlds.

Notes[edit | edit source]

  • When spawning naturally, Skeletron Prime spawns exactly 81 seconds after the status message has appeared.
    • Being in a layer lower than the surface at that moment, or, in singleplayer, exiting the world during that timespan, will prevent Skeletron Prime from spawning naturally.
  • Console VersionOld-gen console version3DS version The bombs fired by the Prime Cannon will only detonate if they hit solid blocks. They will pass through platforms without detonating. This no longer applies as of 1.4.0.1Desktop and Mobile versions, where the bombs will now explode upon contact with platforms as well.

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, Console, and Mobile versions
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, Console, and Mobile versions
Achievement Bona Fide.png
Bona Fide • “You have defeated Skeletron Prime!”
Defeat Skeletron Prime for the first time. Old-gen console version

Tips[edit | edit source]

For more elaborate strategies on defeating Skeletron Prime, including weapon and arena recommendations, see Guide:Skeletron Prime strategies.
  • Console VersionOld-gen console version3DS version 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.
  • Unhindered movement is crucial when Skeletron Prime's head starts spinning, as it deals double the regular damage. Wings greatly aid in moving vertically, and flattened terrain or a sky bridge are convenient for horizontal movement.
  • Although it is a little more time-consuming, focusing on the arms first is very rewarding. Once Skeletron Prime's head is no longer shielded by anything, the fight gets a lot easier. Prioritize damage on the arm which is causing the most damage or disruption, so it can be destroyed and removed from the fight as quick as possible.
  • Due to Skeletron Prime's overall high defense, inflicting it with Ichor is effective, as he is not immune to it. Note that most Ichor weapons lack in damage compared to other weapons, so they should only be used periodically for inflicting the debuff.
    • In fact, as the head is Immune to Cursed Inferno, but not Ichor, Crimson world players have a clear advantage over Corruption world players in this sense. It would be good to go for the Prime Laser first, Prime Cannon second, and the Prime Saw third. If you have enough time you can go for the Prime Vice last, although as it is not too strong you can ignore it.
  • Mobile version Skeletron Prime's bombs will explode on contact with regular platforms, but not on contact with Planter Boxes. Making an arena from Planter Boxes may prove advantageous.

Trivia[edit | edit source]

  • Skeletron Prime will open and shut its mouth for the entire battle. This is a purely cosmetic effect.
  • It is the only mechanical boss whose name contains the Pre-Hardmode boss's name. Furthermore, it is the only mechanical boss to share boss music with its Pre-Hardmode variant. Additionally, its name does not begin with the word "The", unlike the other two Mechanical Bosses.
  • Unlike Skeletron, Skeletron Prime's defense doubles when its head is spinning.
  • Skeletron Prime's head is immune to the Cursed Inferno (Console VersionOld-gen console versionMobile version3DS version only), Penetrated, Celled, and Daybroken debuffs. Its arms, however, are not.
  • Normally, Skeletron Prime’s head has 2,000 less HP than Plantera, but in Expert ModeDesktop, Console, and Mobile versions and Master ModeDesktop and Mobile versions, they both have the same amount.
  • The bombs fired by the cannon resemble the Dirt BombDesktop and Mobile versions, with different coloring on one half.
  • Official Terraria Lore – According to the official game lore, Skeletron Prime was one of the three mechanical recreations of Cthulhu's missing organs. It is a recreation of part of Cthulhu's skeleton.
  • The BestiaryBestiary entry for Skeletron Prime: "Mechanically reconstructed for reviving Cthulhu, this Skeletron has more arms than ever before, and a variety of fierce weapons."

See also[edit | edit source]

History[edit | edit source]

For changes which affect all the mechanical bosses, see mechanical bosses history.
  • Desktop 1.4.1.2: Skeletron Prime's bombs will now explode on contact with Planter Boxes.
  • Desktop 1.4.0.1:
    • Skeletron Prime will now spin faster in Expert Mode.
    • Prime Cannon's Bombs now explode on platforms rather than going through them.
  • 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.

References[edit | edit source]

  1. 1.0 1.1 1.2 1.3 Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI() in Terraria.NPC.cs (under aiStyle == 32) There may be inaccuracies, as the current Desktop version Desktop version is 1.4.1.2.
  2. Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI_106() and method Kill() in Terraria.Projectile.cs (under type == 102) There may be inaccuracies, as the current Desktop version Desktop version is 1.4.1.2.
  3. Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI() in Terraria.NPC.cs (under aiStyle == 36) There may be inaccuracies, as the current Desktop version Desktop version is 1.4.1.2.