Myth is a fully co-operative fantasy game. Players take on the role of one of 5 different heroes working together to defeat the Darkness. Each hero has a different skill set which represented by a unique deck of cards. Players spend Action Points by using cards. Once a certain amount of Action Points have been spent the Darkness fights back by activating monster lairs, spawning monster captains and eventually the Boss.
A complete game in Myth is called a Story. Each Story is played over three Acts. Acts can be played sequentially, or can be split up over three different game sessions.
Players' avatars within a Story are called Heroes. Myth Heroes are clothed in immense power, able to reave all but the mightiest foes. However, this power must be balanced lest the Darkness take too much notice. Players must weigh their actions against the Threat each will bring, with the consequences of awakening more evil and bringing doom on the party's endeavors. And be careful they must, as the Darkness is formidable and eager to snatch glory from the valiant.