Calamity Mod Wiki
Old Lord Oathsword
  • Old Lord Oathsword.png
Stack digit 1.png
TypeWeaponCrafting material
Damage60 Melee
Knockback7 (Strong)
Critical chance4%
Use time23 Fast
TooltipA relic of the ancient underworld
Critical hits cause lava explosions
Inflicts DebuffOn Fire!On Fire!
100% chance

Debuff duration4 seconds (Critical hits)
Debuff tooltipSlowly losing life
RarityRarity Level: 3
Sell 80 Silver Coin.png
Dropped by
Bone Serpent18.33% / 14.29%

The Old Lord Oathsword is a Pre-Hardmode broadsword that drops from Bone Serpents in The Underworld. Critical hits with this weapon summon a fiery explosion on the target, dealing an extra hit of damage and inflicting the On Fire! debuff for 10 seconds.

Its best modifier is Legendary.


Used in


  • The explosion generated by critical hits deals exactly 100% of the weapon's base damage, can not critically strike, does not damage nearby targets, and cannot be modified by any means.