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Expert Mode-Only Content: This information applies only to Expert Mode and Expert Mode worlds.
Mutated Truffle
  • Mutated Truffle.png
Stack digit 1.png
Damage2000 Summon
TooltipSummons a small Old Duke to fight for you
When below 50% life, it moves much faster
Grants BuffMini Old Duke (buff)Mini Old Duke
Buff tooltipThe young duke will protect you
RarityRarity Level: rainbow
Sell 28 Gold Coin.png
Dropped by
The Old Duke1100%
Summons Minion
Mini Old Duke
Mini Old Duke (minion).png
Not to be confused with Shrimpy Truffle, a vanilla mount-summoning item.

The Mutated Truffle is an Expert Mode-exclusive, post-Moon Lord accessory dropped by The Old Duke. It summons a miniature Old Duke minion to attack nearby enemies by ramming into them, dealing 2000 base summon damage. The mini Old Duke will enrage when the player is below 50% of their health, moving and ramming at a much higher speed, also indicated by the mini Old Duke's eyes turning yellow.


  • The miniature Old Duke minion is referred to as "the young duke" in the buff's tooltip, and as such it lacks Old Duke's facial hair, presumably being too young to have grown it yet.