Blue Moon

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Blue Moon
  • Blue Moon item spriteold Blue Moon item sprite
Stack digit 1.png
Damage54 /
23 (Melee)
Knockback6 (Average)
Critical chance4%
Use time45 (Very slow)
RarityRarity level: 2
Research1 required
Projectile created
  • Blue Moon
    Blue Moon
Obtained from Obtained from
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Gold ChestGold ChestGold Chest114.29*1/7 (14.29%)
Golden Lock BoxGolden Lock BoxGolden Lock Box114.29*1/7 (14.29%)
The Blue Moon attacking Target Dummies.

The Blue Moon is a flail that can be found in Gold Chests within the Dungeon, or Golden Lock Boxes found in Dungeon and Stockade Crates. When used, it will emit light around it. The Blue Moon is stronger than the Ball O' Hurt or The Meatball, but is weaker than the Sunfury.

Its best modifier is Godly or Demonic. Both modifiers increase the average damage output by the same amount.


  • In Celebrationmk10 worlds, the Blue Moon can be found with the normally-incompatible Legendary modifier. The size boost will not take effect, though it is still the best modifier possible.


  • The Blue Moon is especially effective in dealing with goblins, clumps of enemies, and large enemies.


  • It appears to match the Water Bolt spell and the Muramasa in appearance, likely because all these weapons are acquired from the Dungeon.
  • The item's name refers to a blue moon, a natural phenomenon.


  • Desktop
    • Damage increased from 23 to 54.
    • Functionality of flails reworked.
    • Sell value increased from 54 to 175.
  • 3DS-Release: Introduced with sprites, mechanics, and stats of Desktop 1.2.