Lady and germs of inferior stock. So far it has been decided that the Darthlukian, or often mistakenly called the 'Darkness', attack in great invasions every 50 years, Starting from the time of the Cataclysm which was the first. These invasions are known as Scourge. These a massive invasions by the Darthlukian that do massive amounts of damage to surrounding infrastructure of nations, and often destroy at least one realm. 

If anyone wants to work out prior contact with the Darthlukian, or be involved in the first grand alliances. That should probably be worked out now that we have a good amount of accepted players.