Each round youll draw three new monster cards, joining any leftover from the last round. Then, a player rolls all available dice, and players begin their turns. On your turn, you place any available die on a monster, doing that dies value amount of damage. If the value matches your characters critical hit number, you get to use your special ability as well! If the total damage is greater than that monsters health, you defeat the monster, collect an item (if any), and move the dice back into the pool.
But its not always so simple! Many monsters have special requirements, like the Ogre who must be defeated before you can even target other creatures! Or the Gremlin, who can only be defeated with three damage EXACTLY!