Mass Effect 3: the Retaliation expansion is online
The DLC is purely based on multiplayer and will give us the opportunity to tackle the Pretorian Collectors, Scion, Abomination, Trooper, and Captain. In addition, Cerberus has hired a new threat called Dragoon and the Geth have implemented their ranks with new drones.
New characters will be introduced as the Turian Havoc Soldier, Ghost Turian Infiltrator and others that will be implemented later.
Some of the existing maps will be re-examined with addition of acid traps, electricity, sandstorms, etc. ..
Will be unlockable new weapons and equipment.
There will be a new database challenges to keep track of their progress and tests that the achievement will credit you with new titles and banners that boast with friends.
In short, a nice hearty DLC does not become absolutely escape.