Calamity Mod Wiki
Slag Magnum
  • Slag Magnum.png
Stack digit 1.png
Damage24 Ranged
Knockback4 (Weak)
Critical chance4%
Use time15 Very Fast
TooltipShoots 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. 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.
  • Because it fires a special projectile, it is unaffected by bullet types. It is advised to focus on bullets that deal higher amounts of damage over bullets that have special effects as the weapon will not be affected by them.