Astrum Deus

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Astrum Deus
Astrum Deus.png
Statistics
TypeBossBurrowing Enemy
EnvironmentAstral Infection
Max Life157,500 / 252,000 / 374,080 / 594,720 (total)
KB Resist100%
Immune toAll debuffs
Drops
Coins20 Gold Coin
Astrum Deus map.png
Map Icon

Astrum Deus Trophy.png "God of the stars and largest vessel of the Astral Infection. " Astrum Deus Trophy.png

Not to be confused with Astrum Aureus.

Astrum Deus are a Hardmode boss that must be defeated in order to allow Astral Ore to be mined. Instead of being a single large worm, such as The Destroyer, the boss is comprised of 10 smaller worms and a longer main worm.

Spawn[edit | edit source]

Astrum Deus can be summoned by killing three Atlas enemies after the Lunatic Cultist is defeated if Astrum Deus has not yet been defeated. Killing the third Atlas will change the time to 7:30 PM regardless of the time beforehand and will start the fight. Future encounters are summoned using the Starcore at Night in the Astral Infection biome.

Segments[edit | edit source]

Main Worm[edit | edit source]

Astrum Deus HeadMain
Astrum Deus Head.png
Statistics
TypeBossBurrowing Enemy
AI TypeAstrum Deus AI
Damage120 / 240 / 300 / 345
Max Life37,500 / 60,000 /
86,080 / 129,120
Defense 60
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration3 seconds
Debuff tooltipYour flesh is burning off
Astrum Deus BodyMain
Astrum Deus Body.png
Statistics
TypeBossBurrowing Enemy
AI TypeAstrum Deus AI
Damage100 / 170 / 195 (Contact)
90 / 152 / 190 / 218 (Astral Laser)
Max Life37,500 / 60,000 /
86,080 / 129,120
Defense 75
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration2 seconds (Contact/Astral Laser)
Debuff tooltipYour flesh is burning off
Astrum Deus TailMain
Astrum Deus Tail.png
Statistics
TypeBossBurrowing Enemy
AI TypeAstrum Deus AI
Damage80 / 136 / 156
Max Life37,500 / 60,000 /
86,080 / 129,120
Defense 90
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration1.5 seconds
Debuff tooltipYour flesh is burning off

Small Worms[edit | edit source]

Astrum Deus HeadSmall
Astrum Deus Head.png
Statistics
TypeBossBurrowing Enemy
AI TypeWorm AI
Damage100 / 200 / 250 / 287
Max Life12,000 / 19,200 / 28,800 / 46,560
Defense (DR)60 (10% DR)
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration3 seconds
Debuff tooltipYour flesh is burning off
Astrum Deus BodySmall
Astrum Deus Body.png
Statistics
TypeBossBurrowing Enemy
AI TypeWorm AI
Damage85 / 144 / 165 (Contact)
90 / 152 / 190 / 218 (Astral Laser)
Max Life12,000 / 19,200 / 28,800 / 46,560
Defense (DR)75 (10% DR)
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration2 seconds (Contact/Astral Laser)
Debuff tooltipYour flesh is burning off
Astrum Deus TailSmall
Astrum Deus Tail.png
Statistics
TypeBossBurrowing Enemy
AI TypeWorm AI
Damage70 / 119 / 136
Max Life12,000 / 19,200 / 28,800 / 46,560
Defense (DR)90 (35% DR)
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration1.5 seconds
Debuff tooltipYour flesh is burning off

Behavior[edit | edit source]

Astrum Deus behave like regular worm enemies, moving through blocks and attempting to ram the player. While they are normally affected by gravity, the worms will gain the ability to fly if the player strays too far from them. They fire lasers from their segments and occasionally summon Astrum Deus Probes.

One of the worms has multiple special Astrum Deus Probes spinning around its head, which shoot astral orbs that slow down over time and eventually stay in place. These orbs will soon form a minefield which the player must carefully weave through or avoid entirely. If the worm which the probes are orbiting is killed, they will quickly begin to circle a different worm.

One of the worms is spectral and has the ability to fly, no matter its distance from the player. It is longer than the other worms and has much more HP. Once all the small worms are killed, the probes begin circling this worm.

After the small worms are damaged a certain amount, the main worm will shortly become vulnerable and the small worms become invulnerable. When the main worm reaches 66% hp, the small worms become vulnerable again and the main worm becomes invulnerable. After continuing to damage the small worms, the main worm will become vulnerable again until it reaches 33% hp. The small worms become vulnerable for the final time and must be defeated. When all the small worms are killed, the main worm gains a sizable defense boost.

If gravity is reversed, such as when using a Gravitation Potion, the main worm gains a significant speed boost and fires more lasers and mines.

In Revengeance Mode[edit | edit source]

  • The probes surrounding one of the worms shoot more mines.
  • The worms are faster.

In Death Mode[edit | edit source]

  • Worms and lasers are faster.
  • Fires more astral orbs.

Summons[edit | edit source]

Image Name Condition
Astrum Deus Probe Astrum Deus Probe Always

Aftermath[edit | edit source]

Notes[edit | edit source]

  • All Astrum Deus segments from both the small and the main worms take reduced damage from non-minion piercing projectiles. Projectile damage is divided by the number of times it pierces with the exception of the tornadoes spawned by the Briny Baron. Infinite piercing deals 20 percent damage with the exceptions of The Empyrean and the large explosion from the alternate fire of the Scorpio which deal 30 percent damage.
  • All of Astrum Deus' loot will spawn at the nearest segment with the exception of 5-15 of the Stardust and the Hearts, which will always spawn at the head.

Tips[edit | edit source]

For more elaborate strategies on defeating Astrum Deus, including weapon and arena recommendations, see Guide:Astrum Deus strategies.
  • Try and keep moving, and don't stay in one spot. Avoid circling the boss as the astral orbs and probes will make it too difficult to do so.
  • Do not attempt to contain the mines in one area, unless you are confident in your dodging capabilities, as having too many mines in one area makes it extremely difficult to break out and leaves the player as easy prey for the small worms.
    • In most instances there will be a large number of mines lingering in the air once the main worm becomes vulnerable. Try not to fight the main worm in the mine-infested areas as their high contact damage and the debilitating debuff that they apply can cripple, if not kill the player.
      • Having a large arena can make this much less of an issue.
  • Astrum Deus’ many minions and abundance of projectiles can, especially on less powerful computers, cause large frame rate drops. This can be used to your advantage by turning frame skip off, giving you more time to process and dodge attacks.
  • Keep in mind that Astrum Deus’ have very high defenses which greatly reduce the amount of damage dealt by weapons. With this, weapons such as the Vortexpopper and The Swarmer will deal very little damage. Therefore, it is recommended to use high damage piercing weapons and equip the Deific Amulet.
  • The Grand Guardian can quickly destroy the worms especially when hitting multiple segments due to the large explosions and homing orbs it creates on hit.
  • The Fallen Paladin's Hammer can deal great damage against the worms at the cost of range whereas the Flame Scythe has longer range at the cost of damage.
  • The Scorpio's alternate fire or The Empyrean deal excellent damage to the worms with a large area of effect.
    • The Aerial Bane is another option that deals massive damage with its bonus against aerial targets.
  • The Lazhar or Forbidden Sun combined with magic boosting equipment can quickly decimate Astrum Deus.
  • The Stardust Dragon Staff can deal good damage to the worms with its piercing abilities.
    • Additionally, the Spikecrag Staff can deal great damage with its large area of effect.
  • The Cranium Smasher or Plaguenades can decimate the worms due to their piercing or area of effect when thrown.
  • If utilizing the Hydra, fire it at the main worm as it will be less effective when fired towards the smaller worms.
  • Avoiding all of the worms is extremely difficult, thus the Cross Necklace can be used to increase the player's immunity frames.
  • The Celestial Jewel helps mitigate the damage done by the Astral Infection debuff.
  • It’s highly recommended that the player utilizes a Frog Leg or an Aero Stone to boost mobility and acceleration.

Trivia[edit | edit source]

  • Astrum Deus' theme is Pest of the Cosmos, which was composed by the artist DM DOKURO.
    • If the Calamity Music add-on mod is disabled, Boss 3 will play instead.
  • "Astrum Deus" means "The Star God" in Latin.

Lore[edit | edit source]

Since ancient times, humans have looked to the skies with admiration and wonder; countless religions place their gods and their heavens amongst the skies. The sun was their god of warmth and life, banishing the darkness and offering hope. The moon was an idol amidst the night — a symbol of light, yet a beguiling one that beckoned with madness.

The stars, they once said, were no single gods. The wondrous stream of stars that stretched across the sky on cloudless nights — the source of those lights was a divine serpent of incomprehensible proportions. Its very nature was unimaginable, to the point that its presence in their reality could only be glimpsed through the countless stars its body birthed. As the collective faith of humanity gathered, it gave rise to the manifestation of their belief: a true god of the stars, soaring through the cosmos.

But even gods could be laid low. Conquering the land countless years after the god of the star's legend was born, the Jungle Tyrant looked to the skies and saw yet another realm to dominate — beginning by striking down Astrum Deus with his own Devourer of Gods. Empowered by those it had already consumed, the Devourer tore open the larger divine serpent’s gut and burrowed in, feasting on its body and killing it from the inside out before crushing its husk to pieces between its coils and scattering the remains to the cold void of space.

In ancient times, it was said that the god of the stars would descend upon the planet in its last days. Its body would infuse the earth with astral power and transform lesser lifeforms into its guardians. The power lingering in its corpse attracted worms to itself, empowering them so that they may grow — and Astrum Deus may one day return to the cosmos. Even when torn asunder, the god's corpse held power; just as the legend that gave rise to it claimed, those fragments of its body would one day fall to the planet and choose a successor to the god of the stars.