Talk:Tiamat/@comment-5690509-20170628012421/@comment-27957947-20170628021426

The dragon only needs to contain one of those elements. When you go to roll the die to try and win a level-up, a list of your appropriately-typed dragons will appear. You chose a dragon from that list and roll. If the die lands on 15 or above, you get one free level-up for the dragon you chose.