Strange. Was it that the symbols wouldn't appear on the dice, or did the dice not appear?
The idea was that you match the symbols on the dice to the ones that appear above enemies or chests to attack/ unlock them. Once you do, you get more symbols that let you face different enemies. Ideally, you would customize your dice based on what you want to do in the dungeon on a particular run. (loot chests or fight specific enemies to get specific symbols). It was an interesting experiment at the very least.