Cosmic Viper Engine

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Cosmic Viper Engine
  • Cosmic Viper Engine.png
Stack digit 1.png
TypeWeaponCrafting material
Damage321 Summon
Knockback6 (Average)
Mana cost10
Use time9 Very Fast
TooltipSummons a cosmic gunship to shoot down your foes
Gunships will fire bullets from your inventory
Alternates firing rockets and bullets
50% chance to save ammo
Rockets do not consume ammo
Grants BuffCosmic Viper (buff)Cosmic Viper
Buff tooltipThe cosmic gunship will protect you
Inflicts DebuffGod Slayer InfernoGod Slayer Inferno
100% chance

Debuff duration3 seconds (Concussion Missile)
2 seconds (Homing, Splitting Rocket)
1 second (Shrapnel)
Debuff tooltipYour flesh is burning off
RarityRarity Level: 14
Sell 40 Gold Coin.png
Research1 required
Summons Minion
Cosmic Gunship
Cosmic Gunship.gif

The Cosmic Viper Engine is a craftable post-Moon Lord summon weapon that is an upgrade to the Tactical Plague Engine. It summons a Cosmic Gunship that fires and consumes bullets. It alternates between firing the chosen bullet and one of the following projectiles:

Projectile Description
Concussion Missile Concussion Missile An insanely fast and accurate missile
Homing Rocket Homing Rocket A very fast homing rocket
Splitting Rocket Splitting Rocket A fast homing rocket that splits into four Cosmic Shrapnelsshrapnels in random directions when getting close to an enemy. Each shrapnel deals 25% damage.

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 Cosmic Viper Engine has over a Ruthless one is knockback.



Crafting Station
Cosmic AnvilCosmic Anvil
Tactical Plague EngineTactical Plague Engine1
Cosmilite BarCosmilite Bar10
Cosmic Viper EngineCosmic Viper Engine1

Used in


  • The "Viper" in this weapon's name is a reference to "Vic Viper", the protagonist of the space shooter game series Gradius.


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 causing issues when summoned with the loadout book from the Summoner's Association mod.
  • Increased sell price from 28 Gold Coin to 40 Gold Coin.
  • No longer uses 20 Exodium Clusters in its recipe.
    • Minions no longer uses the Optic Staff minion AI style.
    • Increased movement speed and doubled its target range.
    • Buffed damage from 138 to 321.
    • Now consumes and fires bullets every other shot.
    • Halved inaccuracy when firing a rocket and removed all rocket damage multipliers.
    • Fixed splitting rocket dealing ranged damage.
    • Concussion Missile now inflicts God Slayer Inferno for 3 seconds instead of 5.
    • Homing and Splitting Rockets now inflict God Slayer Inferno for 2 seconds instead of 3.
    • Nerfed damage from 255 to 138.
    • Now has a use time of 9 instead of 10.
    • No longer uses Nightmare Fuel or Endothermic Energy in its recipe, and now requires a Cosmic Anvil to craft instead of a Draedon's Forge.