Calamity Mod Wiki
Slag Magnum
  • Slag Magnum.png
Stack digit 1.png
Damage24 Ranged
Knockback4 (Weak)
Critical chance4%
Use time15 Very Fast
TooltipConverts musket balls into fossil shards that split into additional shards on death
Inflicts DebuffArmor CrunchArmor Crunch
100% chance

Debuff duration2 seconds (Slag Round)
1 second (Fossil shard)
Debuff tooltipYour armor is shredded
RarityRarity Level: 5
Sell 7 Gold Coin.png 20 Silver Coin.png
Projectiles created
Slag Round
Slag Round
Fossil Shard
Fossil Shard
Dropped by
Earth Elemental125%

The Slag Magnum is a Hardmode gun that is dropped by Earth Elementals. When Musket Balls are used as ammo, it fires a special bullet that inflicts the Armor Crunch debuff on targets for a short time, which reduces their defense by 15, and splits into 4 small shards on impact which deal 35% of the original bullet's damage.

Its best modifier is Unreal.


  • Because of the high armor reduction, it is much more effective on enemies with high defense. This means it can be quite potent as a support weapon throughout the entire rest of the game.
  • Due to how early it is available and its powerful effect, it is an excellent weapon against the Mechanical Bosses.
  • Its effect is very similar to Crystal Bullets, making it an excellent crowd control tool.