The League of Legends Website has details on a new co-op mode being added to this Defense of the Ancients-inspired strategy game in the "near future." This will allow players to join forces to play against the game's AI, but be warned, the machines are being bolstered for this onslaught. Here's word:

League of Legends is known to be a competitive game where millions of players are battling fierce PvP matches each day. Now a new game mode has been announced and it is time for human players to join forces and fight against selected champions controlled by a clever and tactical artificial intelligence. Coop vs AI will soon be added to League of Legends and gives players the chance to practice with their friends and secretly try new tactics before heading into the real PvP. But be warned, do not underestimate the AI - they have lots of tricks up their sleeves and will not hesitate to use them.