Astrum Aureus

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Astrum Aureus
Astrum Aureus.png
EnvironmentAstral Infection
AI TypeAstrum Aureus AI
80 / 176 / 198 / 209
74 / 128 / 148 / 160 (pre-Moon Lord)
480 / 552 (post-Moon Lord)
80 / 140 / 160 / 172 (pre-Moon Lord)
480 / 516 (post-Moon Lord)
Max Life84,000 / 134,400 / 171,200 (pre-Moon Lord)
624,000 (post-Moon Lord)
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 melting off
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoFrostburnAbyssal FlamesArmor CrunchDemon FlamesPlagueNightwitherShredWhispering DeathSilva StunDaybrokenHoly FlamesMarkedShellfish ClapsVenomSulphuric PoisoningBetsy's CursePenetratedDryad's BaneCelledEnragedWar CleaveKami Flu
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.

Spawn[edit | edit source]

Astrum Aureus does not spawn on its own and must be summoned at Night using the Astral Chunk in the Astral Infection biome.

Behavior[edit | edit source]

When first summoned, Astrum Aureus will start in its recharging phase. While recharging, Astrum Aureus will deal no contact damage and has no defense. Once its flames ignite, Astrum Aureus will begin to attack the player and cycle through its attack pattern. At the end of each cycle, it will stop moving and enter its recharging phase again. All attacks inflict the Astral Infection debuff.

If Astrum Aureus is alive when it becomes daytime, it will enrage, moving faster and jumping significantly farther.

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, getting more aggresive as its health decreases.
    • Its jumps scale in height based on how high the player is and will attempt to intercept them if they're moving.
  • Shoots bursts of lasers directly at the player, firing them faster as its health decreases.
  • At 50% health Astrum Aureus also:
    • Launches three consecutive waves of eight Astral CrystalAstral Flame 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. Astral flame crystals will lose their homing capabilities after six seconds and will fly offscreen.
    • Teleports near the player, this happens shortly after the crystals are fired.

In Revengeance Mode[edit | edit source]

  • Can fire one wave of astral flame crystals above 50% health.
  • Summons a pair of Aureus Spawns; they are initially passive, but will become homing bombs if they take enough damage, which explode in 10 seconds or upon hitting a tile.
  • Once the Moon Lord is defeated, Astrum Aureus's health and projectile damage become buffed.
  • Can jump through tiles.

In Death Mode[edit | edit source]

  • Crawls faster and jumps more aggresively.

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.

General[edit | edit source]

  • Moving in a semi-circle around Astrum Aureus while it fires lasers can help the player successfully avoid them.
  • The astral flame crystals gain increased velocity and homing capabilities the closer they are to the player, making it essential that the player keeps their distance from them until they launch away.
  • In Revengeance Mode, avoid damaging the Aureus Spawns. They are initially harmless and will only attempt to harm the player if they take enough damage.

Trivia[edit | edit source]

  • Astrum Aureus's theme is Interstellar Stomper, which was composed by the artist DM DOKURO.
    • 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.
    • Prior to Interstellar Stomper's implementation, Astrum Aureus's theme was Cosmic Disgust, which was originally intended for the Astrageldon Slime. This is why the theme's introduction contains a motif from The Slime God's theme.
  • 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.