Ascension

From BoardGameGeek:

A cooperative survival game in three acts that uses two regular decks of cards (more if playing with more than two players). Players choose a character out of four classic RPG heroes and try to defeat a deck of enemies. The story, set in Greek mythology, focuses on two villagers in the outskirts of Athens who find their village under attack by an army of men and monsters. When helps comes unexpectedly, they are given the chance to fight back - and they take the fight to the very Gods who are wrecking their beautiful land.