Calamity Mod Wiki
Tactical Plague Engine
  • Tactical Plague Engine.png
Stack digit 1.png
TypeWeaponCrafting material
Damage52 Summon
Knockback0.5 (Extremely Weak)
Use time14 Very Fast
TooltipSummons a plague jet to pummel your enemies into submission
Jets will fire ammo from your inventory, 66% chance to not consume ammo
Sometimes shoots a missile instead of a bullet
Grants BuffTactical Plague Engine (buff)Tactical Plague Engine
Buff tooltipA giant plague jet is following you
Inflicts DebuffPlaguePlague
100% chance

Debuff duration3 seconds (Missile)
Debuff tooltipRotting from the inside
RarityRarity Level: 10
Sell 20 Gold Coin.png
Summons Minion
Plague Jet
Plague Jet.png

The Tactical Plague Engine is a craftable post-Moon Lord summon weapon. When used, it summons a Plague Jet minion that fires and consumes bullets. It will attempt to fire from above, and will occasionally fire homing missiles instead of bullets, which inflict the Plague debuff and deal 150% of the weapon's base damage. Additionally, it will always align itself horizontally when idle.

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 Tactical Plague Engine has over a Ruthless one is knockback.



Used in

ResultIngredientsCrafting station
Cosmic Viper EngineCosmic Viper EngineCosmic AnvilCosmic Anvil
total: 1 row(s)


  • It is recommended to use the Endless Musket Pouch with this weapon as it gives the player infinite ammo, negating the need to have several stacks of bullets in the player's inventory to use the weapon effectively.
  • This summon weapon can be used to great effect when paired with Ichor Bullets as it can inflict Ichor on enemies without the player having to switch weapons.
    • However, as the minions shoot quite fast, this can be quite expensive.