Slag Magnum

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Slag Magnum
  • Slag Magnum.png
Stack digit 1.png
Damage24 Ranged
Knockback4 (Weak)
Critical chance4%
Use time15 Average
Velocity48 effective
TooltipConverts musket balls into fossil shards that split into additional shards on impact
Inflicts DebuffArmor CrunchArmor Crunch
100% chance

Debuff duration2 seconds (Slag Round)
1 second (Fossil shard)
Debuff tooltipYour armor is shredded
RarityRarity Level: 5
Sell 4 Gold Coin.png 80 Silver Coin.png
Research1 required
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 used with Musket Balls, it converts them into slag rounds that do not pierce and split off into 4 small shards on impact which deal 35% of the original bullet's damage. Both the slag rounds and shards inflict the Armor Crunch debuff.

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.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Reworded tooltip to no longer use "on death".
  • Decreased sell price from 7 Gold Coin.png 20 Silver Coin.png to 4 Gold Coin.png 80 Silver Coin.png.
  • Buffed Slag Round velocity multiplier from 2x to 4x.