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Eternity Mode-Only Content: This information applies only to Eternity Mode and Eternity Mode worlds.
Skeletron Prime (Eternity Mode)
Skeletron Prime (Fargo's Mod).gif
AI TypeSkeletron Prime AI
Max Life63,000
KB Resist100%
Immune toAll debuffs
Map Icon Skeletron Prime (Fargo's Mod).png
Map Icon

Focus on taking down that metal skull, not its limbs. Don't try to outrun its spinning limbs! Keep your eyes open and learn to recognize what's doing what.

Fargo's Mod/DevianttDeviantt

For the vanilla page, see Skeletron Prime.

Eternity Mode Skeletron Prime is a Hardmode boss. It is a more powerful version of Skeletron Prime with more attacks and new behavior.


This topic is a WIP

Phase 1[]

Immune to traps

Prime Cannon shoots cannonballs more frequently and periodically shoots Dark Stars

Cannonballs can hurt the player while airborne and inflict Defenseless

Prime Laser shoots a spread of lasers with better accuracy

All contact damage and lasers inflict Nano Injection.

Telegraphs spinning with a targeting reticle and in phase 1 only, summons 4 walls of guardians imploding on horizontal and vertical directions when it starts spins

Phase 2[]

Enters phase 2 at 75% life. In phase 2:

Gains four additional limbs that attack by swiping diagonally

only four of the limbs(one of each type) are vulnerable to damage, and attack at a time.

Prime Vice swings down at the player while Prime Saw quickly stabs from the sides

Prime Laser will shoot 2 spreads of lasers around the player. it shoots more spreads of lasers as its health decreases. this is to prevent the player from circling Skeletron Prime

Skeletron Prime moves faster overall and becomes much faster when spinning

Shoots rings of dark stars consists of dozen spreads of dark stars instead of rockets while spinning. as its health decreases, the more dark stars are shot

Main limbs will stretch out and spin when Prime spins in phase 2, they can reach out further if you escape the circle

When brought to zero life, regains 100 more life, loses all limbs, and enters Dungeon Guardian mode, similar to Skeletron in Eternity Mode. note that its dungeon guardian form is faster than Skeletron's.


Source Debuffs
Map Icon Skeletron Prime (Fargo's Mod).png Most attacks Fargo's Mod/Nano InjectionNano Injection
Map Icon Skeletron Prime (Fargo's Mod).png Head, Rockets, and Cannonballs Fargo's Mod/DefenselessDefenseless
Map Icon Skeletron Prime (Fargo's Mod).png Rockets DazedDazed


Prime Cannon
Prime Cannon (Fargo's Mod).png
TypeBoss Part
Prime Saw
Prime Saw (Fargo's Mod).png
TypeBoss Part
Prime Vice
Prime Vice (Fargo's Mod).png
TypeBoss Part
Prime Laser
Prime Laser (Fargo's Mod).png
TypeBoss Part


  • Skeletron Prime drops Some Kind of Metallic Skull when spawned if it has not yet been defeated on spawn.
  • If Plantera is defeated, Skeletron Prime can spawn naturally during night time.


  • If the Eternity Mode Recolors option is turned on in the Mod Configurations menu, it resembles Omegatron from Edge of Space with a Gunmetal palette.
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