The developer behind the massively multiplayer online real-time strategy (MMORTS), Ironfell, released a new expansion to his free-to-play indie game this weekend.

The Regal Realms expansion adds ten new units and introduces the Keep and Castle Realms. The Keep and Castle serve as entrances to new realms – the Keep is designed for new players to launch attacks at surrounding lands, while the (much more expensive) Castle excels at defense.

The hex-tile time travel indie MMORTS is free-to-play and currently in open beta. To sign up to play, visit Ironfell.