Riders of Icarus

Riders of Icarus is an upcoming free-to-play action-adventure MMORPG featuring intense aerial combat unlike anything seen before in the genre. Players take flight on the backs of fantastical beasts, ranging from fire-breathing dragons to ferocious bears, to fight by both land and air in the experience MMO players have been waiting for. 

Sign up at http://icarus.nexon.net/