Feral Heart

I'm thinking of School of Dragons if you like the How To Train Your Dragon franchise. I started playing in 2013 and it's still pretty fun. You can train your own dragons in the game (as one might expect). The only thing you have to pay for is membership if you want that. I myself don't really think it's that necessary unless you want Toothless or a flight suit.

Here's the website: http://www.schoolofdragons.com/