"Prepare to face off against the Collector Praetorian, Scion, Abomination, Trooper and Captain. Reports have also come in that Cerberus has enlisted the Dragoon to their ranks and the Geth are deploying new Drones to the battlefield," a Bioware spokesperson wrote in a blog post. "A host of new characters have joined the war to fight this new threat, including the Turian Havoc Soldier, Turian Ghost Infiltrator, with many more being added on a regular basis."
Retaliation allows players to wage war across six maps, all of which features new environmental hazards and traps. In addition, a regular rotation of Firebases will be introduced to different hazards as they come under attack, including acid, lightning, meltdowns, sandstorms swarms and whiteouts.