Aureus Spawn

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Aureus Spawn
Aureus Spawn.png
TypeFlying Enemy
Damage75 / 112 Expert Mode / 128 Revengeance Mode / 144 Death Mode / 225 Master Mode (Contact)
This attack will cause defense damage on hit. 172 Revengeance Mode / 184 Death Mode / 240 Master Mode (Explosion)
88 / 156 Expert Mode / 184 Revengeance Mode / 212 Death Mode / 264 Master Mode (Astral Laser)
Max Life3000 / 4500 Master Mode
KB Resist100%
Inflicts debuffAstral Infection (debuff)Astral Infection
100% chance

Debuff duration1.25 seconds
Debuff tooltipYour flesh is melting off
Immune toConfusedPearl AuraAstral Infection (debuff)Poisoned
Cold Bestiary Cold.png-
Water Bestiary Water.png-
Sickness Bestiary Sickness.pngResistant
Electricity Bestiary Electricity.png-
Heat Bestiary Heat.pngVulnerable

The Aureus Spawn is a Hardmode boss servant that is summoned by Astrum Aureus. Upon initially spawning, it will attempt to fly into the player, exploding on contact for heavy damage. Once its health drops below 50%, it will pause briefly, start glowing bright blue, and rapidly charge towards the player, additionally exploding upon death or after some time has passed. If a Spawn collides with Astrum Aureus in this state, it will explode instantly and damage Astrum Aureus for a small percentage of its maximum health.

On Death Mode, Aureus Spawn will fire Astral Flame Crystals when not charging, and will additionally explode into several Astral Lasers upon death, with the spread being less numerous if directly killed by the player.


  • If spawned during the day, it will immediately act as if its health is below 50% and start accelerating towards the player.
  • During the Boss Rush, they will have 3,000 max health regardless of difficulty.


  • If in pursuit of the player, it will die instantly if it comes into contact with blocks. Because it is affected quite heavily by momentum, the player should attempt to draw it towards tiles as much as possible before dodging, so its previous speed carries it into them and destroys it.
    • A good way of doing this is to build boxes of solid blocks above your arena, and when being chased by the Aureus Spawn double back on them below or above your boxes, this should cause them to run into your box and subsequently be destroyed.
  • The Ornate Shield, Asgard's Valor, or the Asgardian Aegis can be used to dash through them, making them explode without damaging the player.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • Buffed contact damage from 66 / 112 Expert Mode / 128 Revengeance Mode / 138 Death Mode / 180 Master Mode to 75 / 112 Expert Mode / 128 Revengeance Mode / 144 Death Mode / 225 Master Mode. Changed laser damage from 88 / 156 Expert Mode / 184 Revengeance Mode / 200 Death Mode / 270 Master Mode to 88 / 156 Expert Mode / 184 Revengeance Mode / 212 Death Mode / 264 Master Mode.
    • No longer immune to lifesteal.
  • Decreased Astral Infection duration from 1.5 seconds to 1.25.
  • Decreased Astral Infection duration from 2 seconds to 1.
  • Now affected by the Boss Health Boost Percentage configuration option.
  • Now properly displays vanilla debuff colors and Hunter Potion effects.
    • The duration of the Astral Infection debuff inflicted now scales with its size.
    • Always spawns after Astrum Aureus teleports, no longer teleports, and always chases the player regardless of health.
    • If an Aureus Spawn is reduced to 50% health, it will glow and start chasing faster; in this state, colliding with Astrum Aureus will cause it to explode and deal a small percentage of its maximum health as damage.
  • Removed the stat buff that it received after defeating Moon Lord.
  • Now fires homing lasers towards the player instead of flame crystals in Death Mode.
    • Buffed contact damage from 65 / 130 Expert Mode / 150 Revengeance Mode / 180 Death Mode to 75 / 150 Expert Mode / 172 Revengeance Mode / 184 Death Mode.
    • Now vulnerable to heat debuffs, but resistant to sickness debuffs.
    • Death Mode changes:
      • Now charges at the player for 10 seconds instead of 5 before exploding.
      • Now fires Astral Flame Crystals every 3 seconds while not charging.
      • Can now move away from other Aureus Spawns.
    • Buffed post-Moon Lord health from 3000 to 8250.
    • Decreased post-Moon Lord damage multiplier from 3x to 2x.
    • No longer immune to any debuffs except Confused, Pearl Aura, Astral Infection, and Poisoned.
    • Buffed health from 1008 to 3000.
    • Buffed Boss Rush health from 1002 to 30,000.
    • Buffed defense from 0 to 10.
    • No longer has 99.9999% damage reduction.
    • Changed health from 1012 / 1007 Expert Mode to 1008 in all modes.
    • Buffed contact damage from 150 Revengeance Mode / 172 Death Mode to 150 Revengeance Mode / 180 Death Mode.
  • Nerfed damage from 150 Revengeance Mode / 172 Death Mode to 150 Revengeance Mode.
    • No longer deals increased damage in Death Mode.
    • No longer deals contact damage.
    • Fixed it not spawning in Boss Rush.
  • Now inflicts Astral Infection for 2 seconds.
    • Buffed damage from 100 / 200 Expert Mode / 300 Death Mode to 150 / 300 Expert Mode / 450 Death Mode.
    • Now spawns closer to Astrum Aureus.
    • Can no longer be lifestealed off of.
    • Decreased speed.