From the release:
The heroes of Terrinoth are known to live a solitary existence, favoring uninhibited adventure over the companionship offered by a team. But as dangers grow across the realm, defenders will have to band together to beat back the impossible odds that face them. The safety of the Free Cities must outweigh old rivalries, but setting their differences aside may prove to be the most difficult task the adventurers have ever attempted.
Fantasy Flight Games is proud to announce that the Unbreakable Bonds expansion for Runebound Third Edition is now available! With new heroes, scenarios, and forms of gameplay, as well as a wide variety of new asset and skill cards, this expansion offers players hours of enhanced gameplay to unite and pursue glory!