Insidious Impaler

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Insidious Impaler
  • Insidious Impaler.png
Stack digit 1.png
Damage198 Melee
Knockback8 (Very Strong)
Critical chance4%
Use time20 Average
TooltipFires infected harpoons that stick to enemies and explode
Inflicts DebuffAcid VenomAcid Venom
100% chance

Debuff duration2 seconds
Debuff tooltipLosing life
Inflicts DebuffSulphuric PoisoningSulphuric Poisoning
100% chance

Debuff duration1 second
Debuff tooltipThe acidic water burns away your flesh
RarityRarity Level: 13
Sell 35 Gold Coin.png
Research1 required
Dropped by
The Old Duke125% / 33.33% Expert Mode

The Insidious Impaler is a post-Moon Lord melee weapon that is dropped by The Old Duke. When used, it throws out a harpoon that sticks to enemies and tiles and can travel in the air for 0.5 seconds before falling to the ground. Upon contact with enemies, it damages them up to 8 times before exploding, releasing green or purple particles. The harpoons inflict the Acid 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.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • Nerfed damage from 320 to 198 and use time from 15 to 20, but buffed shot speed from 5 to 15. It now uses the melee no speed damage type instead of melee.
    • No longer a spear that fires harpoons when thrusted, and instead directly throws its harpoons.
    • Harpoons now have 1 extra update instead of 2, and fall after traveling for 0.5 seconds.
    • Increased sell price from 26 Gold Coin to 35 Gold Coin.
  • Fixed it lingering for extra animation cycles when switching to another spear while in use.
  • Now inflicts Venom and Sulphuric Poisoning for 3 seconds instead of 6.
    • Nerfed damage from 350 to 210.
    • Projectile now grants 5 local immunity frames instead of 7.5.