Armored Core: Verdict Day

The storyline is set in a future world wherein three factions are fighting over natural resources. In online multiplayer mode, which is the main focus of the game, players select a faction and battle players from the others, either in teams or by forming their own team of artificial intelligence-driven mechs. Mechs can be customized with different weapons and skills, and the behavior of AI mechs can be customized as well. The persistent world is reset when one faction dominates the others or when the season ends. Source: Wikipedia, "Armored Core: Verdict Day", available under the CC-BY-SA License.