Some spoilerish content ahead for the upcoming Mass Effect 3’s ‘Omega’ DLC, you have been warned. About a month ago, someone managed to dig up details on the conflict between Cerberus and Omega, the asteroid underworld ran by Aria T’Loak, buried on the Mass Effect 3 game disc.
Back then; the data did not make much sense but with the recent announcement of the Omega DLC things seem to have clicked into place. Apparently, Aria has been ousted by the illusive man, and she’s come to you for help on the subject. Along the way, you’ll meet and possibly kill Mass Effect 2’s Zaeed Massani, who has signed up with Cerberus.
Here’s the information pertaining to the DLC:
Aria greets you and explains her situation. She has an uneasy truce with Cerberus – they’re still going back and forth through the Omega 4 relay to investigate the Collector base from the end of ME2. (If you destroyed it, they’re still trying to salvage the pieces). Cerberus doesn’t bother Omega as long as Omega doesn’t bother Cerberus – and that’s how Aria likes it. Life in Omega continues as always, turning a blind eye to the war. The Afterlife is still a happening place.
But Omega is a good source of eezo (mining) and you need it. Aria balks at providing it since this would break her neutrality and bring Cerberus down on her head. But you convince her to provide eezo by pointing out that Cerberus and the Reapers will inevitably turn against her, so she may as well face them now. She sees the wisdom, but there’s a price. She will ask for a favor in the future.
In another part of the text we see this information:
Aria tells you that Omega is now under a blockade from Cerberus. Since a direct attack didn’t work Cerberus is now trying to starve Omega into submission by blockading supply ships coming in through the regular Omega relay.
The level’s appearance will change to reflect this — the Afterlife has gone quiet, the music is off, the flashing lights are gone, maybe a soup kitchen has taken over the dance floor. Aria requests that you steal into the blockade and board the command ship. Take down the blockade so Omega can be resupplied.
Zaeed’s mission takes place after Shepard’s lifted the blockade. Colonel Armitage, the Cerberus envoy who orchestrated the blockade, has fled the station. Aria wants Shepard to track him down.
As punishment for breaking the neutrality pact, Cerberus launches an attack against Omega. The enemy is attempting to destroy Omega’s shields, which will allow asteroids and meteors to smash into the station. You must repel the assault and ensure the shield remain operational.
You arrive at Omega as it is under seige. Cerberus is attacking Omega as punishment for siding with Shepard.
Aria thanks you for breaking the blockade. Now is the time to ask for that favor she had mentioned earlier.
There is a lost ship on the other side of the Omega-4 relay that has “pirate booty” that she desires. Bring it back to her and Omega’s eezo processing is at Shepard’s disposal.
Since their direct assault failed, Cerberus is now blockading Omega in an effort to starve it into submission. You must destroy the main Cerberus command ship responsible for the blockade.
You must journey to the other side of the Omega-4 relay to an old derelict ship and secure the “pirate loot” there. In the endgame, this will buy you the loyalty of Omega’s criminal fleet.
A notorious Cerberus tactician orchestrating the Omega blockade crashes on a planet after being attacked by Aria’s raiders. Aria wants to grill the tactician and asks you to retrieve her before Cerberus does. Your shuttle down to the planet is rocked by a missile: Cerberus has had time to establish a defensive perimeter.
You are forced to make an emergency landing and must fight through patrols, traps and a deadly environment to get to the Cerberus ship. Once there, you are confronted by Zaeed: He’s signed on again with Cerberus as the tactician’s bodyguard, and is determined to fulfill his contract. After a fight you have a chance to either persuade the merc that he’s on the wrong side or finish off Zaeed. Either way, you take the tactician back to Omega.
Source: Hold The Line