Sins of a Dark Age is a dark fantasy-themed MOBA with a unique hero customization system. Instead of fighting for pre-defined objectives, teams compete to complete quests throughout the map which grant them bonuses.
Hooray! Dark Fantasy MOBA, Sins of a Dark Age, joins the brotherhood of Free to Play Mobas, hopefully adding new players into its ranks. The game had previously been on early access and is now available to players with servers in several regions. One major point to note is that the game is not restricted by location, which is an important factor to those with friends across the world. The game also features steam and twitch integration, which is becoming all the more important nowadays.
Ironclad Games has a great site page that highlights the features of their game here.