Alliance
Alliance is a multiplayer mode in Assassin's Creed: Brotherhood. Alliance places players into three teams of two players each. Each team are the hunters of one team and the prey of the other team. It is advised to work together to hunt down and avoid the other teams as this mode is more reliant on teamwork then the others. [1] In the introductory trailer for this mode, you see multiple teams (each of two players who share a multiplayer character skin) cooperating with each other to bring down the enemy teams. The trailer shows that kills can be made with one player locking onto the target, with the other making the actual kill. The lock-on ability works for all modes including Manhunt as well enabling bonuses to score for marking targets for allies.
Advanced Alliance
This mode is the same as basic Alliance, apart from the fact that the compass to locate targets is reduced in effectiveness, such as not being told whether a target is above or below you and adds a greater emphasis on stealth gameplay as it will make you have to be more accurate in who you are hunting whilst also evading the the hunter looking for you.