Coal is an item rewarded for completing Winter Wonderland, Silent Night, or Winter Mire on Nightmare difficulty.

With 88 Coal in their item box, the player can create a Diamond pet in their tavern. This pet can have stats of up to 800. It also increases the hero's movement speed.

Further more, it is possible to get 'Small Coal' by completing the holiday-themed maps on Medium to Insane difficulty settings. These will turn into a small diamond once you have 88 of them. Since, however, their stats are worse than a Giraffe or Kobold on a Treadmill, they are considered less desirable.

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