Chaos Stone

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Chaos Stone
  • Chaos Stone.gif
Stack digit 1.png
TooltipMana Sickness from drinking mana potions is replaced by Mana Burn
Mana Burn deals damage over time relative to the intensity of the debuff
This debuff does not reduce your magic damage
'One of the ancient relics'
Inflicts DebuffMana BurnMana Burn
Debuff tooltipThe excess of mana sears your body and mind
RarityRarity Level: 7
Sell 9 Gold Coin.png 60 Silver Coin.png
Research1 required
Dropped by
Calamitas Clone125% / 33.33% Expert Mode

The Chaos Stone is a Hardmode accessory that is dropped by Calamitas Clone. When equipped, the Mana Sickness debuff, which is normally inflicted upon players when they drink Mana Potions or their variants, is replaced by the Mana Burn debuff.

Mana Burn deals damage over time to the player, which decreases logarithmically as the debuff timer elapses. Specifically, the formula for the damage is: i*6i+1, where i is a decimal representation of the remaining time on the debuff; at 5 seconds left, it is 0.5, at 10 seconds left, it is 1.0, etc. This peaks at 36 damage per second at the maximum duration of 10 seconds.

Unlike Mana Sickness, Mana Burn does not reduce the player's magic damage, meaning they can achieve greater damage output at the cost of damaging themselves.


  • Identically to Mana Sickness, the Mana Burn duration increases by 5 seconds every time a Mana Potion is consumed and cannot exceed 10 seconds.
  • If the player is somehow inflicted with Mana Sickness while this item is equipped (e.g. through other mods), the Mana Sickness is instantly removed, and its duration is added to the current duration of Mana Burn.
  • This accessory synergizes excellently with the Last Prism, Dark Spark, and Yharim's Crystal, as they all have extreme damage output but cost huge amounts of mana to sustain, which normally means Mana Sickness heavily drags down their DPS. The Mana Flower or one of its upgrades is also recommended to be used alongside these weapons, as otherwise the player would have to spam the Quick Mana hotkey.


  • The Chaos Stone was originally intended to be a way to spawn Scoria Ore, but was ultimately instead added as an accessory.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Fixed an issue where it would still allow the player to be inflicted with Mana Sickness in very specific scenarios.
    • No longer grants stat boosts. It now makes consuming mana potions give the Mana Burn debuff instead of Mana Sickness. This debuff causes a damage over time effect instead of reducing magic damage.
    • Increased drop rate from 10% to 20%.
  • Buffed damage boost from 2% to 3%, but removed critical strike chance boost.