How To Craft Skeletron Prime

Skeletron Prime

Skeletron Prime.png Old-gen console version and Nintendo 3DS version

Map Icon

Drops

Coins	12 30

Item (Quantity) Rate
100%
100%
14.29%
100%
14.29%
10%
100%
14.29%
100%
100%
100%

Internal NPC ID: 127

"The air is getting colder around you..."

Not to be dislocated with Skeletron, the pre-Hardmode boss.

Skeletron Prime is a Hardmode mechanical boss which is essentially a more than difficult version of Skeletron. It consists of a head and 4 limbs, merely, similarly to Skeletron, but the head needs to be defeated to defeat the boss.

Skeletron Prime number can be summoned manually using a Mechanical Skull at night (7:30PM to four:30AM). Information technology also has a 10*1/10 (10%) gamble to spawn naturally at dusk one time a Demon or Ruby Altar has been destroyed, every bit long as it has not yet been defeated at least once in the current world. If spawning this fashion, its arrival is announced past the condition message "The air is getting colder around you...".

If Skeletron Prime is not defeated by dawn, it will carry much like a Dungeon Guardian: Information technology volition terminate using its limbs and instead charge at the role player at extremely high speeds, dealing commonly lethal harm upon contact.

While Skeletron Prime is live, the music Boss 1 will play. When Otherworldly music is enabled, the track Boss 2 (Otherworldly) will play instead.

Arms

Prime Cannon

Internal NPC ID: 128

Prime Vice

Internal NPC ID: 130

Prime number Laser

Internal NPC ID: 131

Behavior

Skeletron Prime number's caput constantly endeavors to remain betwixt 31.5 and 12.5 tiles higher up the player and inside 6.25 tiles of either side of the player. Information technology tin accelerate infinitely in order to move dorsum into this area. The head does not actively endeavor to make contact with the player.^[ane]

Skeletron Prime'south four limbs all have unique attacks:

Prime Cannon fires Bombs every 2.33 seconds that do not destroy tiles^[4], usually upwardly into the air rather than direct at the player. It usually stays to a higher place the player.
Prime number Saw usually remains under the player, moving up and down.
Prime number Vice will swipe effectually wildly, making occasional lunges at the player. It usually remains diagonal to the thespian.
Prime Laser shoots red Death Lasers every iii.33 seconds, similar to those of Retinazer and The Destroyer, and is e'er pointed at a player. It ordinarily stays horizontal to the player.

Every 10 seconds, Skeletron Prime will enter a spinning stage for 6.67 seconds, in which its attacks go more aggressive:

Skeletron Prime's head volition grow spikes and start moving towards the thespian at 10 mph , exactly like how its pre-Hardmode counterpart Skeletron does. Damage and defense are doubled to 94 / 158 / 238 harm and 48 defense force.^[1] In Expert Mode , the base spinning speed is 31 mph and is increased the further the player is away, up to a maximum of 76 mph at a altitude of 37.5 tiles.
Prime number Cannon will aim at the thespian directly and decrease its cooldown betwixt firing to 0.67 seconds.
Prime Saw will begin homing straight towards the player's location.
Prime Vice becomes more aggressive and frequently lunges towards the actor.
Prime Light amplification by stimulated emission of radiation will fire lasers every i.33 seconds.
Skeletron Prime lets out a roar every time it enters the spinning stage.

Upon dawn (4:thirtyAM), Skeletron Prime number will enrage and permanently comport like a faster Dungeon Guardian, increasing its velocity^[five] and usually killing the player instantly if touched: its harm increases to 1000 and its defense raises up to 9999.^[one] It will remain in this land until defeated, fifty-fifty if it becomes night once more. If defeated, it will drib items normally.

If the thespian is more than than 375 tiles abroad, Skeletron Prime will start moving downwards and will rapidly despawn.^[one]

Notes

This content is transcluded from Mechanical bosses § Notes.

When spawning naturally, a mechanical boss spawns exactly 81 seconds after the condition bulletin has appeared. Being in a layer lower than the Surface at that moment, or, in singleplayer, exiting the world during that timespan, volition foreclose the dominate from spawning naturally.
With the 10*ane/10 (10%) take chances of spawning naturally at dusk, the resulting chance for each mechanical boss is initially three.33*1/30 (3.33%). In one case one of them has been defeated, the remaining ii have a resulting five*1/20 (v%) run a risk of spawning naturally, and after defeating the 2nd ane, the last one has the total chance of 10*one/10 (10%).
An Middle of Cthulhu naturally spawning volition take precedence over a mechanical boss naturally spawning.^[six]
A Lantern Night occurring will prevent a mechanical boss from naturally spawning. Still, summoning a mechanical dominate using one of the summon items will cancel out the Lantern Night, but like whatsoever other boss summon.
It is possible to summon a mechanical boss pre-Hardmode if the summoning item is brought in from another globe. All the same, if the Wall of Mankind has not been defeated, Plantera's Bulbs will non start spawning.
The Bombs fired by the Prime Cannon will only detonate if they hit solid blocks. They will pass through platforms and Planter Boxes without detonating. On the Desktop version, Console version, Mobile version, and Nintendo Switch version, the Bombs do explode upon contact with platforms and on the Desktop version, Console version, Mobile version, and Nintendo Switch version, they besides do detonate when hitting Planter Boxes.

Achievements

Achievement Buckets of Bolts.png

Buckets of Bolts • "Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime."

Achievement Mecha Mayhem.png

Mecha Mayhem • "Practice battle against the Twins, the Destroyer, and Skeletron Prime simultaneously and emerge victorious."

Defeat all 3 Mechanical Bosses simultaneously in a single battle.

Achievement Bona Fide.png

Bona Fide • "You have defeated Skeletron Prime!"

Tips

Continuing on platforms / Planter Boxes far from blocks can mostly nullify the effects of the Prime Cannon, every bit its projectiles just detonate on blocks, while passing through those tiles harmlessly.
Unhindered movement is crucial when Skeletron Prime's head starts spinning, as it deals double the regular harm. Wings greatly assist in moving vertically, and flattened terrain or a heaven bridge are convenient for horizontal motion.
Although it is a piddling more than fourth dimension-consuming, focusing on the artillery kickoff is very rewarding. One time Skeletron Prime's head is no longer shielded by anything, the fight becomes a lot easier. Prioritize impairment on the arm which is causing the nigh damage or disruption, then it tin be destroyed and removed from the fight as quick every bit possible.
A good idea is to focus on the Prime Laser first, every bit it is harder to dodge than the other limbs.
Due to Skeletron Prime's overall high defense, inflicting it with Ichor is effective, as it is not immune to it. Notation that well-nigh Ichor weapons lack in impairment compared to other weapons, and then they should only be used periodically for inflicting the debuff.
- In fact, every bit the head is immune to Cursed Inferno merely non Ichor, Scarlet world players take a clear reward over Abuse world players in this sense.

Trivia

Skeletron Prime will open and shut its mouth for the unabridged duration of the battle, except for when its caput is spinning. This is a purely cosmetic result.
Information technology is the only mechanical boss whose proper noun 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, dissimilar the other ii mechanical bosses.
Unlike Skeletron, Skeletron Prime's defense doubles when its head is spinning.
Although Skeletron Prime'due south head is allowed to Cursed Inferno and Penetrated , its limbs are not.
Normally, Skeletron Prime number'south head has 2000 less HP than Plantera, but in Proficient Way and Master Mode , they both have the aforementioned amount.
The Bombs fired by the cannon resemble the Clay Bomb , with different coloring on 1 one-half.
Skeletron Prime is the only boss with more two arms.
The sprite file for Skeletron Prime's artillery is named Arm_Bone_2.
– According to the official game lore, Skeletron Prime was 1 of the three mechanical recreations of Cthulhu'due south missing organs. It is a recreation of part of Cthulhu's skeleton.

The Bestiary entry for Skeletron Prime number: "Mechanically reconstructed for reviving Cthulhu, this Skeletron has more than arms than ever before, and a diverseness of fierce weapons."

History

Desktop 1.iv.1.2: Prime Cannon's Bombs will at present explode on contact with Planter Boxes.

Desktop one.4.1: Skeletron Prime is at present vulnerable to Cursed Inferno.

Desktop 1.4.0.1:
- Skeletron Prime AI overhaul: will at present Act similar to Skeletron and spin faster in Expert Mode.
- Prime Cannon's Bombs now explode on platforms rather than going through them.
- Added two Master Mode drops, Robotic Skull and Skeletron Prime Relic.

Desktop 1.3.5: Sprite updated. Erstwhile sprite was .

Desktop 1.3.0.i: Added an Skillful Manner drop, Mechanical Battery Slice.

Desktop ane.2.3:
- Increased health, impairment and defence of most parts.
- Now drops Skeletron Prime Mask.
- Fixed bug where the player could defeat Skeletron Prime by destroying the Prime Cannon mitt and non Skeletron Prime itself.

Desktop 1.two:
- Now has a chance to spawn naturally at dusk with the message: "The air is getting colder around you...".
- Will now drib 20–40 Souls of Fright, instead of 20–30.
- At present drops Skeletron Prime Trophy.
- Reduced health, harm and defense force of all parts and head.

Desktop 1.1: Introduced.

Panel i.0.933.1: Added Expert mode drib, Mechanical Battery Slice. ()

Console 1.0.750.0: Added Expert fashion drib, Mechanical Battery Piece. ()

Console-Release: Introduced.

Mobile 1.1.5536: Introduced.

3DS-Release: Introduced.

References

↑ ^1.0 ^1.1 ^1.2 ^ane.3 ^1.iv ^one.v Data taken from the Desktop i.four.1.2 source code, method AI() in Terraria.NPC.cs (under aiStyle == 32 ) There may exist inaccuracies, every bit the current Desktop version is 1.4.3.6.
↑ Data taken from the Desktop 1.4.0.5 source code, method AI_106() and method Kill() in Terraria.Projectile.cs (under type == 102 ) There may be inaccuracies, every bit the current Desktop version is 1.4.3.6.
↑ Data taken from the Desktop one.4.3 source code, method AI() in Terraria.NPC.cs (nether aiStyle == 36 ) At that place may be inaccuracies, every bit the electric current Desktop version is 1.iv.three.6.
↑ In For the worthy , the Bombs do destroy tiles.
↑ Skeletron Prime's velocity is based on its distance to the player, following this formula: $\text{velocity}_{\text{mph}} = \frac{9}{11} * \text{distance}_{\text{tiles}} + \frac{1125}{22}$ Information technology ranges from 51 mph at a altitude of zero tiles to 164 mph at a distance of 137.5 tiles, where it is capped. Information taken from the Desktop 1.4.1.2 source code, method AI() in Terraria.NPC.cs (nether aiStyle == 32 ). There may exist inaccuracies, as the current Desktop version is 1.four.3.6.
↑ Information taken from the Desktop one.4.3.6 source code, method UpdateTime() in Terraria.Primary.cs.