Calamity Mod Wiki
Insidious Impaler
  • Insidious Impaler.png
Stack digit 1.png
Damage210 Melee
Knockback8 (Very Strong)
Critical chance4%
Use time20 Very Fast
TooltipFires a harpoon that sticks to enemies and explodes
Inflicts DebuffVenomVenom
100% chance

Debuff duration6 seconds
Debuff tooltipLosing life
Inflicts DebuffSulphuric PoisoningSulphuric Poisoning
100% chance

Debuff duration6 seconds
Debuff tooltipThe acidic water burns away your flesh
RarityRarity Level: 13
Sell 26 Gold Coin.png
Projectile created
Insidious Harpoon
Insidious Harpoon
Dropped by
The Old Duke125% / 33.33%

The Insidious Impaler is a post-Moon Lord spear which drops from The Old Duke. It throws a spear that is unaffected by gravity and sticks to blocks and enemies, releasing toxic and sulphuric clouds that inflict the Venom and Sulphuric Poisoning debuffs.

Its best modifier is Godly. It cannot get modifiers that affect size. Ruthless might be preferred if the player already has 100% critical strike chance.


  • Despite the tooltip mentioning a harpoon, the projectile behaves more like a spear.