Money
In my opinion this game starts out easy but then as you level up it gets harder and harder to get enough xp. Its pretty easy to get gold but gems/crystals are really hard to get. Last but not least one of the worst things about this game is how long it takes to finish breeding, opening the elemental chest and upgrading your habitats. This game is starting to go to trash.
timf4444 about
Dragons World, v1.94000