Dungeon Siege: Throne of Agony
There are numerous pets and companions to play with. Gameplay involves switching between unique pets and companions to use their special powers. Face over 100 monsters (some from the Dungeon Siege world as well as many new creatures).
Cooperative campaign allows you to play with a friend where each player can bring a pet or companion. The game also has multi-player "Battle Arenas" for players who don't have time for a full campaign.
Charles Lentz (85)