Heroes of Thessalonica is a new MMOG based around the mythical lore of the Dark Ages where a variety of fantastical races lived in harmony in a land called Thessalonica. Though the world existed in harmony, soon came the "Great Calamity", wherein the world was thrown into ruin by an invading, Draconian army. The races of Thessalonica united and, led by a Hero from each class, they defeated the Draconian army but tension rose amongst the races as each claimed superiority over the others.

Now, long after the war, the Draconians have returned and the races of Thessalonica must reunite in order to overcome the powerful opposition.