Dragons, creatures, turn-based RPG elements, breeding, and fun.
Currency is not too difficult to earn, there is of course regular (Treasure) that one can earn from playing games and selling items, and premium (Gems) that can be bought (and, rarely, found). There is almost always a trading of Gems for Treasure in the forum marketplace, as there are certain prized items that are only available in one currency or the other.
Caring for dragons is not terribly difficult, and while there is a bonus for keeping all of your Flight consistenly well-fed, your dragons will not 'die' or 'run away' if they are neglected (though any eggs in the nest left uncared for will rot away). I really like this aspect because, while it does not take very long to log in and check up on your dragons, I am assured that if I travel or am otherwise indisposed that all of my dragons will not disappear.
The breeding system is interesting. There are 10 different breeds of dragon (with an 11th on the way), all with different levels of rarity. The dragons come in a wide range of colors, and offspring appearance can be predicted by using this color wheel: the shortest distance between the parents' colors are the potential colors of the offspring.
Definitely worth a look if you like pet-sites and dragons. Though I will say that the site is still in its very early stages, with occasional issues. But I have a good feeling that this site will grow over the coming months into something worth spending time on.
You can check out some of the artwork here:
And the actual game here: Flight Rising
My username is Luminium, of the Light Clan. Look me up!