Astrum Aureus

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Astrum Aureus
Astrum Aureus.png
AI TypeAstrum Aureus AI
90 / 144 / 180 / 207
90 / 140 / 161 (pre-Moon Lord)
420 / 483 (post-Moon Lord)
90 / 140 / 175 / 201 (pre-Moon Lord)
525 / 604 (post-Moon Lord)
Max Life96,000 / 153,600 / 195,200 / 299,200 (pre-Moon Lord)
704,000 (post-Moon Lord)
Defense (DR)70 (15% DR)
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection (debuff)
100% chance
Debuff duration1 second (Lasers)
2 seconds (Crystals)
3 seconds (Contact)
Debuff tooltipYour flesh is burning off
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesArmor CrunchDemon FlamesPlagueNightwitherShredWhispering DeathSilva StunDaybrokenHoly FlamesMarkedShellfish ClapsEnraged
Coins 15 Gold Coin.png (pre-Moon Lord)
30 Gold Coin.png (post-Moon Lord in Revengeance Mode)
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.

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, and drops a new mount; additionally, it 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. After cycling through its attacks, it must stop moving and recharge again. While recharging, Astrum Aureus deals no contact damage and has no defense. All attacks inflict the Astral Infection debuff.

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.
  • At 50% health Astrum Aureus also:
    • Launches eight energy crystals from itself in every direction, which fly some distance before homing in on the player. These projectiles gain increased speed and homing when the player is near them.
    • Teleports near the player, this happens shortly after the crystals are fired.

In Revengeance Mode[edit | edit source]

  • Uses all attacks regardless of health.
  • 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 Aureus Spawn In Revengeance Mode or in the Boss Rush

Aftermath[edit | edit source]

Notes[edit | edit source]

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

Tips[edit | edit source]

For more elaborate strategies on defeating Astrum Aureus, including weapon and arena recommendations, as well as a more in-depth breakdown of the fight, see Guide:Astrum Aureus strategies.
  • Avoid damaging the Aureus Spawns. They are initially harmless, and will only attempt to harm the player if they take enough damage.
  • The Terra Shiv and the True Ark of the Ancients both have a huge advantage over Astrum Aureus due to their powerful projectiles, allowing the player to easily hit Astrum Aureus while dodging.
  • The Conclave Crossfire or the Megalodon, combined with Terra Bullets, can quickly defeat Astrum Aureus.
  • The Leviatitan is able to deal substantial damage to Astrum Aureus, despite the high defense of the boss.
  • The Ballista deals massive amounts of damage to Astrum Aureus when the arrows are fired against the ground it walks on, letting all of the shrapnel from the arrows hit it.
  • 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 can deal massive damage to Astrum Aureus due to its lingering projectiles.
  • 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.
  • 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 was 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.
      • Although DM DOKURO has made a proper theme for Astrum Aureus (Interstellar Stomper), it has yet to be implemented.
    • If 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.