Celestial Onion

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Celestial Onion
  • Celestial Onion.png
Stack digit 9.pngStack digit 9.pngStack digit 9.pngStack digit 9.png
TypePermanent power-up
Use time30 Very Slow
TooltipPermanently increases the number of accessory slots
This item does nothing in Master Mode
Alien power pulses inside its layers
RarityRarity Level: 10
SellNo value
Research1 required
Dropped by
Moon Lord1100% / 100% Expert Mode / 0% Master Mode

The Celestial Onion is a permanent power-up item that is dropped by the Moon Lord. Upon consumption, it permanently gives the player a sixth (seventh Expert Mode) accessory slot. This effect does not stack and can only be used once per player.

If the player does not have a sixth accessory slot yet, the Celestial Onion can be used, and it will grant the sixth accessory slot. If in Expert Mode, the seventh slot will not be granted until the player also consumes the Demon Heart.


  • If the Demon Heart has also been consumed, the seventh slot does not appear in the player's inventory while in Normal Mode, whether there is an item inside it or not.
  • It does nothing in Master Mode, or if a seventh accessory slot (or more) has already been obtained through the use of other mods.
  • The Moon Lord will not drop the Celestial Onion in Master Mode.


  • The onion was previously referred to as 'MLGRune2' in reference to its original function of activating Prepare to Die/Cry.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Fixed it missing research support.
  • Will not grant an additional accessory slot while the player is in a Master Mode world.
  • Tooltip now says "Alien power pulses inside its layers" instead of "Doesn't do anything currently...or does it!?".
    • Can now be used in Normal Mode, and no longer has the Rarity Level: rainbow rarity.
    • Resprited.
  • Now drops from Treasure Bag instead of directly from Moon Lord.
    • Now grants an extra accessory slot when used.
    • Now only drops in Expert Mode and uses the Rarity Level: rainbow rarity instead of Rarity Level: 1.
    • Decreased use animation from 45 to 30 and it now stacks to 99.
    • Now uses the Item4 sound effect instead of Item119 when used.
    • Now consumable.
  • Using it while a boss is alive no longer causes the player to drop all their items.
  • Using it while a boss is alive now instantly kills the player, drops all of their items, and despawns the boss.
  • Now enables Prepare to Die Mode, enables Prepare to Cry Mode if used after Demon Trophy.