The Age of Empires Online new booster pack Skirmish Hall has released. The popular MMO real time strategy (RTS) based on the popular series of PC games has seen slow, but steady growth and now has one of its first major booster upgrades since launch.
The Skirmish Hall pack allows fully customizable battles which can feature massive numbers of units with some epic new abilities because of their large numbers. These battles can only be done in player vs. computer (PvC) games, though players can ally with one another against computer opponents.
A release trailer gives more detail in a quick overview.