Crown Jewel

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Crown Jewel
  • Crown Jewel.png
Stack digit 1.png
TypeAccessoryCrafting material
Tooltip+1 HP/s life regen
You gain an additional +1.5 HP/s life regen while afflicted with any debuff
Massively boosts natural life regen while afflicted with any debuff
RarityRarity Level: 1
Sell 20 Silver Coin.png
Research1 required
Dropped by
King Slime110%
If you were looking for the boss summons, see Crown Jewels.

The Crown Jewel is a Pre-Hardmode accessory that is dropped by King Slime. When equipped, it provides 4 defense and increases the player's life regen by 2. When afflicted by any debuff, it increases their life regen by an additional 3 (for a total of 5), and massively increases their natural life regen.


Used in


  • None of the effects stack with any of its upgrades other than the defense provided.
  • When afflicted by any debuff, natural life regen is increased by applying a lower bound of the lifeRegenTime variable to 1800 at all times, which effectively provides a headstart of 30 seconds.
    • This would persist even when all debuffs run out until the player gets hit, which would then reset it to 0. Getting hit while debuffed would still reset lifeRegenTime to 1800 due to the lower bound.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • Reworked:
      • Nerfed base defense boost from 5 to 4.
      • Now increases life regeneration by 2, with an additional 3 life regeneration and a boost to natural life regeneration while inflicted with a debuff. Defense boost while inflicted with a debuff now slowly fades away when no longer inflicted with a debuff.
    • Now drops from King Slime in all difficulties instead of in Malice Mode. Decreased drop chance from 100% Malice Mode to 10%.
    • Now grants 5 defense.
    • Nerfed defense boost under a damaging debuff from 10 to 8.
    • Buffed life regeneration boost from 1 to 2, and life regeneration boost while under a damaging debuff from 2 to 4.
    • Now drops from King Slime in Malice Mode instead of in Revengeance Mode.
  • Now drops from Treasure Bag instead of directly from King Slime.
    • Halved all life regeneration boosts.
    • Removed life regeneration boost when affected by any of the Drunk Princess' drinks.
    • Nerfed defense boost while affected by one of the Drunk Princess' drinks from 20 to 10.
  • Nerfed defense boost when under a damaging debuff from 15 to 10.