In Descent, one player will take on the role of the evil overlord, facing off against the rest of the players on the board. The heroes may win or lose as a team by taking on quests meant to stop the evil control over the board. The overlord spends the game spreading monsters, building a deck, and setting up quests. Each chosen quests determines the victory condition of each game—meaning no two playthroughs are alike.

Descent 2nd Edition Official Rules (PDF)