Calamity Mod Wiki
Borealis Bomber
  • Borealis Bomber.png
Stack digit 1.png
Damage35 Summon
Knockback5 (Average)
Use time19 Very Fast
TooltipSummons aureus bombers to fight for you
Aureus bombers explode on enemy impact
Does not consume minion slots
Inflicts DebuffAstral Infection (debuff)Astral Infection
100% chance

Debuff duration2 seconds (Impact and Explosion)
Debuff tooltipYour flesh is melting off
RarityRarity Level: 7
Sell 12 Gold Coin.png
Projectile created
Aureus Bomber
Aureus Bomber
Dropped by
Astrum Aureus125% / 33.33%

The Borealis Bomber is a Hardmode summon weapon that drops from Astrum Aureus. It summons a floating Aureus Bomber that does not take up minion slots and follows the player. It attacks by charging at enemies and then exploding upon impact, inflicting the Astral Infection debuff. If an Aureus Bomber explodes, the minion will despawn.

Its best modifier is Mythical, due to its unique nature of not requiring minion slots to be used and being able to be summoned in large numbers with a low enough use time, resulting in high damage output.


  • Due to these properties, this weapon is essentially a Magic weapon for the Summoner class. It avoids the damage penalty for Minions while also scaling with Summoner equipment, giving a decent amount of damage in comparison with other classless weapons available.
  • The Bombers can be summoned with no empty Minion slots and without de-summoning pre-existing summons.
  • The Bombers follow any enemy on a line roughly 43 blocks width, though they will not pursue enemies behind walls.
  • The Bombers explode after about ten seconds if they do not explode before.


  • Using mana recovery potions in conjunction with Mana Flower can make this weapon more effective because the player can summon many Aureus Bombers without running out of mana and getting afflicted with the Mana Sickness debuff.