Talk:Game Updates/@comment-31671362-20170930124921/@comment-31833772-20170930125435

It depends on the level of the dragons you are rolling for. If a dragon is level 13, for example, you need to roll 14 or higher to level it up, but say for a level 19 dragon, you could only roll a 20 (or a 21 if you spend gems) to level it up.