Astrum Aureus

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Astrum Aureus
Astrum Aureus.png
AI TypeAstrum Aureus AI
90 / 144 / 180 / 225
90 / 140 / 175 (pre-Moon Lord)
420 / 525 (post-Moon Lord)
90 / 140 / 175 / 218 (pre-Moon Lord)
525 / 654 (post-Moon Lord)
Max Life63,750 / 102,000 / 130,080 / 201,760 (pre-Moon Lord)
640,000 (post-Moon Lord)
Defense (DR)120 (10% DR)
KB Resist100%
Inflicts debuffGod Slayer InfernoGod Slayer Inferno
100% chance
Debuff duration2 seconds (Crystals)
4 seconds (Contact)
Debuff tooltipYour flesh is burning off
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesArmor CrunchDemon FlamesPlagueNightwitherShredWhispering DeathSilva StunDaybrokenHoly FlamesMarkedShellfish ClapsEnraged
Coins 20 Gold Coin.png (pre-Moon Lord)
3 Platinum Coin.png (post-Moon Lord)
Astrum Aureus map.png
Map Icon

Astrum Aureus Trophy.png "A titanic cyborg infected by a star-borne disease..." Astrum Aureus Trophy.png

Not to be confused with Astrum Deus, a similarly-themed worm-like boss, or Astrageldon Slime, its removed predecessor .

Astrum Aureus is a Hardmode boss. Defeating it causes an Astral Infection meteor to fall somewhere in the world.

After defeating the Moon Lord in Revengeance Mode or Death Mode, Astrum Aureus increases substantially in difficulty, with boosted health and damage; additionally, it also starts to drop Lunar Fragments, regardless of difficulty.

Spawn[edit | edit source]

Astrum Aureus does not spawn on its own and must be summoned at Night using the Astral Chunk. Despite being connected to the Astral Infection biome, it can be summoned anywhere.

Behavior[edit | edit source]

When first summoned, Astrum Aureus will be inactive for a few seconds, charging up its energy. Once its flames ignite, Astrum Aureus will begin to attack the player with several projectiles, minions, and movement patterns.

Attacks[edit | edit source]

  • Crawls around on the ground and periodically jumps into the air above the player in an attempt to crush them or get on level ground with them.
  • Shoots bursts of lasers directly at the player, firing them faster as its health decreases.
  • Launches eight energy crystals from itself in every direction, which fly some distance before homing in on the player, inflicting the God Slayer Inferno debuff if they hit.
  • Occasionally teleports near the player.

In Revengeance Mode[edit | edit source]

  • Summons a pair of Aureus Spawns; they are initially passive, but will become homing bombs if they take enough damage.
  • Once the Moon Lord is defeated, Astrum Aureus's health and projectile damage become buffed.

Summons[edit | edit source]

Image Name Condition
Aureus Spawn.png Aureus Spawn In Revengeance Mode

Notes[edit | edit source]

  • Be careful straying too far from it (such as flying to high altitudes), as Astrum Aureus will despawn if it cannot teleport to the player.

Aftermath[edit | edit source]

Tips[edit | edit source]

  • Avoid damaging the Aureus Spawns. They are initially harmless, and will only attempt to harm the player if they take enough damage.
  • Melee weapons with projectiles such as the Tyrant Yharim's Ultisword and the Terra Blade have a huge advantage over Astrum Aureus, allowing the player to easily hit it while dodging.
  • The Conclave Crossfire or the Megalodon, combined with Terra Bullets, can quickly defeat Astrum Aureus.
  • Using the Tears of Heaven is highly recommended due to its homing ability, allowing the player to focus more on dodging.
  • The Entropy's Vigil and Tavernkeep Rods can be enough to quickly defeat Astrum Aureus.
  • The Ballistic Poison Bomb deals decent damage to Astrum Aureus.
  • It is recommended to use Angel Treads to avoid the boss's quick attacks, and to have some sort of triple or quadruple-jump accessory to dodge the boss itself.
  • Astrum Aureus is an endurance fight, as its large heath pool and defense along with the Aureus Spawns makes it take little damage, while requiring the player to consistently dodge; thus, it is highly recommended that defensive accessories are used in place of damage-boosting ones.
  • While being only able to fire two shots per boss fight, the Bazooka can help deal a large amount of damage to Astrum Aureus.

Trivia[edit | edit source]

  • Astrum Aureus's theme is Cosmic Disgust, which is composed by the artist DM DOKURO.
    • Because this theme was originally intended for the Astrageldon Slime, the theme's introduction contains a motif from the Slime God's theme; however, it has been confirmed that DM DOKURO will make a proper theme for Astrum Aureus in the future.
    • When the Calamity Music Add-on mod is disabled, Boss 3 will play instead.
  • Astrum Aureus replaces a removed boss, the Astrageldon Slime, which was a boss that fought much like the King Slime, but was twice as big and emitted lasers in bursts at the player.
  • Astrum Aureus's name roughly translates to "golden star" in Latin, although its name is actually a reference to an infectious bacteria named staphylococcus aureus.
  • Astrum Aureus's design was inspired by Security Robot B.O.X. from Metroid Fusion, as both their appearance and movements are similar, and are also both cyborgs that have been infected by a space infection.

Lore[edit | edit source]

When the Astral virus first appeared in Terraria to warp the landscape around it, the site became a phenomenon of interest to Yharim himself. What destructive power, what force of chaos, could have made such drastic changes in a phage that it could assimilate nearly any material into something similar to its own molecular structure? Commissioning Draedon to research the pathogen, Yharim had him look for a method to take advantage of the virus’ virtually alchemic traits, to see if they could be harnessed to serve his needs. Of course, Draedon’s first step was to collect samples. To accomplish this objective, he decided to once more construct an automaton to do his bidding. Although his assistants were at his disposal, he decided against it, as the environment would clearly not be suitable for humans. However, his blunder was in underestimating the enslaving factor of the Astral virus. Even the circuit boards and metal of the great machine he had built to lumber across the infected landscape and bring back subjects, succumbed to the enslaving will of the pathogen. However, this was by no means a disappointment to Draedon. To him, this was a sign of great promise, showing that the extent of the virus’ power was not limited to organic beings. Finding no need for the great machine any longer, Draedon abandoned it. Now, it stays dormant in the Astral Biomes, only awaking to protect these infections from outside threats.