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  • Cosmilamp.png
Stack digit 1.png
TypeWeaponCrafting material
Damage127 Summon
Knockback4 (Weak)
Mana cost10
Use time14 Fast
TooltipSummons a cosmic lantern above your head to fight for you
Each lantern takes up 2 minion slots
Grants BuffCosmilamp (buff)Cosmilamp
Buff tooltipThe cosmilamp will protect you
RarityRarity Level: 12
Sell 30 Gold Coin.png
Research1 required
Dropped by
Signus, Envoy of the Devourer125% / 33.33% Expert Mode
Summons Minion
Cosmilamp (minion).gif
Not to be confused with Cosmic Lantern, a boss servant enemy spawned by Signus.

The Cosmilamp is a post-Moon Lord summon weapon that is dropped by Signus, Envoy of the Devourer. It summons a Cosmilamp which hovers above the player and fires homing cosmic beams towards nearby enemies. Cosmic beams pierce twice and travel through tiles. Each Cosmilamp takes up 2 minion slots.

Its best modifier is Ruthless. The Mythical modifier provides the widest array of stat bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, minions cannot deal critical hits. The only lasting advantage a Mythical Cosmilamp has over a Ruthless one is knockback.


Used in


  • The Cosmilamp is based off of the Cosmic Lantern that is summoned by Signus, Envoy of the Devourer.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Increased sell price from 24 Gold Coin to 30 Gold Coin.
    • Reworked:
      • Buffed damage from 89 to 127.
      • Instead of charging, it now fires cosmic beams which home into enemies and pierce twice.
      • Lamps now idle around the player and create a wave formation and movement when multiple are present.
  • Cosmic Lanterns now have a unique AI.
  • Cosmic lanterns are now less accurate and grant 12 effective local immunity frames instead of 8.
    • Nerfed damage from 230 to 150.
    • Minions now grant 8 effective local immunity frames instead of 2.
    • Each minion takes 2 minion slots.
  • Minions now have 1 extra update, grant 2 effective local immunity frames, and reduced the size of their dust.
  • Minions now grant 3 local immunity frames instead of 4.
  • Minions now grant local immunity frames instead of global immunity frames when hitting enemies.
  • Minions no longer collide with blocks.