Gloomhaven is a game of Euro-inspired tactical combat in a persistent world of shifting motives. Players will take on the roles of wandering adventurers with their own special sets of skills and their own reasons for traveling to this dark corner of the world. Players must work together out of necessity to clear out menacing dungeons and forgotten ruins. In the process, they will enhance their abilities with experience and loot, discover new locations to explore and plunder, and expand an ever-branching story fueled by the decisions they make.

This is a game with a persistent and changing world that is ideally played over many game sessions. After a scenario, players will make decisions about what to do next, which will determine how the story continues, kind of like a “Choose Your Own Adventure” book. Playing through a scenario is a co-operative affair where players will fight against automated monsters using an innovative card system to determine the order of play and what a player does on their turn.

Even for those who have played Gloomhaven before, this edition brings new material to the table, with rebalanced and redesigned mercenary classes, items, and scenarios, as well as brand new artwork, newly written narrative and events, updated miniatures, a new faction-based reputation system, and more.

How much has changed mechanically in Gloomhaven Second Edition?
Scenarios:

• 32 Slightly Modified
• 36 Significantly Modified
• 14 Reworked
• 14 New
• 5 Unchanged

Items:

• 76 Modified
• 19 Reworked
• 43 New
• 14 Unchanged

Events:

• 15 Modified
• 163 New
• 2 Unchanged

Monsters:

• 14 Slightly Modified
• 20 Significantly Modified
• 2 New
• 0 Unchanged

Personal Quests:

• 4 Modified
• 8 Reworked
• 6 New
• 4 Unchanged

And More...

• Battle Goals increased from 24 to 60
• 120+ New Non-Scenario narrative sections
• New Faction reputation system
• New optional difficulty mechanic

For even more info check out the game's page on boardgamegeek