Dungeon Boss

From the publisher's site: Dungeon Boss is a fast-action battle game loaded with tons of powerful heroes to collect and ascend. Summon your team to take down heavy hitting Bosses and their tireless minions from one challenging territory to the next. Build up your own power teams, and gain allies with cool Hero Sharing features, in this new free-to-play game. http://forum.dungeonboss.com/