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Not to be confused with Ethereal Core, a permanent power-up that increases the player's maximum mana.
  • Starcore.png
Stack digit 1.png
TypeBoss summon
TooltipSummons Astrum Deus at the Astral Beacon, but is not consumed
Enrages during the day
'May the stars guide your way'
RarityRarity Level: 9
SellNo value
Research1 required

The Starcore is a craftable Hardmode boss-summoning item that is used to summon Astrum Deus. It can only be used at an Astral Beacon in the Astral Infection during the night.

This item is only accessible after Astrum Deus has been defeated; before defeating Astrum Deus, consumable Titan Hearts must be used instead.



Crafting Station
Ancient ManipulatorAncient Manipulator
Starblight SootStarblight Soot25
Aureus CellAureus Cell8
Astral BarAstral Bar4


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Added a comma and removed the period from the last line of its tooltip.
  • Can no longer be used during Boss Rush.
    • Now uses the Rarity Level: 9 rarity instead of Rarity Level: 7.
    • Now uses 4 Astral Bars in its recipe, and now requires an Ancient Manipulator to craft instead of a Hardmode Anvil.
    • No longer stacks to 20.
    • No longer sold by the Wizard.
  • Now non-consumable and stacks to 1 instead of 20.
  • Tooltip now mentions the name of what boss it spawns.
  • Now uses 25 Stardust in its recipe instead of 4 Hallowed Bars and 15 Stardust.
  • Now uses 8 Astral Jelly, 4 Hallowed Bars, and 15 Stardust in its recipe instead of 7 Hallowed Bars, 2 Living Shards, and 10 Stardust.
  • Now sold by the Wizard after defeating Astrum Deus.
    • Now uses the boss roar sound effect instead of Item44 when used.
    • Now directly spawns the boss instead of using an invisible projectile.