The dodecahedron of doom was a rather large die, both magical and mechanical in creation, that caused a number of arcane effects when it was thrown across the floor.[1]


The metal dodecahedron had twelve sides, each of which was painted with a number 1 through 12. Overall, it measured 12" (30.5 cm) across. Clockwork machinery composed its inner workings, which whirled and clicked whenever the die was cast.[1]


Depending on the side that faced up whenever the die was thrown, one of six possible effects occurred:

  • 1, 2: The dodecahedron burst in an explosion and was completely destroyed.[1]
  • 3, 4: A light spell was cast upon the die, which remained until it was touched by any creature.[1]
  • 5, 6: A ray of frost shot out from the die towards a random person or creature.[1]
  • 7, 8: The next creature to touch the dodecahedron was hit by a shocking grasp.[1]
  • 9, 10: A darkness spell was cast upon the die, lasting for 10 minutes.[1]
  • 11, 12: The next creature to touch the die became significantly more resilient for an hour's time.[1]


One of these dodecahedrons found its way into the scrap piles of Trobriand's Graveyard, sometime before the Year of Three Ships Sailing, 1492 DR.[note 1][1]



  1. Canon material does not provide a year for the events described in Waterdeep: Dragon Heist, but Christopher Perkins answered a question via Twitter and stated the year was 1492 DR. Unless a canon source contradicts this assertion, this wiki will use 1492 DR for events related to this sourcebook and Waterdeep: Dungeon of the Mad Mage (which is referenced on pages 5 and 98 of Dragon Heist).


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