Mass Effect 2: Dossier: The Assassin - walkthrough Mass Effect 2 guide, walkthrough

Last update: 02 June 2021

Received from: The Illusive Man [Normandy SR-2]

Description: This quest will appear in your journal automatically after completing the first Collector mission on the surface of the planet Horizon. In order to proceed with this mission you must use a mass relay and travel to the Crescent Nebula. Land on a planet Illium located in the Tasale system to find yourself in [Illium - Nos Astra]. Start off by talking to the Concierge and you'll find out that Liara T'Soni wishes to speak to you.

During your conversation with Liara you must ask her if she knows where to find Thane (the assassin) and you'll find out that you're going to have to talk about that to Seryna. She can be found in the shipping and loading section of [Illium - Nos Astra] (first screenshot). After you've asked her a few questions you must confirm that you want to travel to the towers and you'll watch a cut-scene. You'll also have a chance to ask her additional questions during the flight.

You'll soon arrive in [Illium - Dantius towers]. Start off by ordering members of your team to take cover, because LOKI and FENRIS mechs seen in the distance will start running towards you as soon as the force field has been disabled. Destroy them and head forward. After you've reached the next area start off by checking a room located to your left. You can use a medical station there and collect 4800 credits from a computer terminal.

Return to the previous room and this time choose a passageway located to your right. You'll soon encounter a wounded salarian worker and obviously you should take your time to talk to him. If you want to score paragon points you should heal him (paragon interrupt). Otherwise focus only on asking him a few questions.

Save your current progress and then open a nearby door. Head through a long tunnel and order your team members to take cover near the entrance to the next room (first screenshot). Notice that Eclipse soldiers and mechs (LOKI & FENRIS) have begun showing up in the next area. Eliminating them shouldn't be a problem and you can even continue moving forward while killing them instead of occupying certain areas for longer periods of time.

Make sure to explore one of the side rooms along the way (first screenshot). I would recommend that you leave your team here and head forward alone. Doing this will allow you to surprise enemy units. Be careful, because elite Eclipse troopers will soon join the battle and you'll have to remember about destroying their shields.

Keep heading towards a passageway where you can see Eclipse troops and mechs showing up (first screenshot). You'll be given a chance here to choose a side corridor (second screenshot) in order to surprise enemy units. Make sure it's safe, order your followers to get to you and save your game!

Use a ramp to get to an upper level. You should be able to find two med kits here (first screenshot) and immediately after taking them you can attack new enemy units. This time you'll be going against much larger groups of Eclipse units, but on the other hand you won't have to worry about encountering a lot of mechs. Take your time and don't forget to always focus on eliminating more powerful troopers.

There are two passageways leading to the next area - you can choose the left corridor (first screenshot) which is going to be heavily guarded or you can choose the right corridor (second screenshot) which would allow you to surprise some of the enemy units. Keep pushing forward and don't forget to use cover, especially when going after larger groups.

You should also consider destroying crates during the course of this battle, preventing your enemies from taking cover. After you've won look around to find one more med kit and then inspect a new corridor found to your left (second screenshot).

Follow this corridor to the end and you'll have a chance to collect several items, including M-97a Viper sniper rifle and power cells. There's also a terminal nearby (4200 credits). I would now recommend that you hack a door leading to a small room (second screenshot) by solving a well-known mini-game. You'll encounter several new workers inside and once they're gone you can take a med kit and 3000 credits from a locker.

Approach the elevator (first screenshot). Save your game, order your followers to take cover somewhere nearby and interact with the elevator door. Get ready to fight two Eclipse engineers and a bounty hunter (mini-boss). I would recommend that you start off by destroying the drones and then focus on the krogan. Use a heavy weapon to take him down quickly.

Begin attacking the engineers AFTER you've dealt with the mini-boss. Try eliminating them quickly so they won't have a chance to spawn more drones and pay attention to what the rest of your team is doing. You may enter the elevator and confirm that you want to travel to a new floor. Upon your arrival you'll witness a cut-scene featuring one of Eclipse troopers.

There are three ways to solve this problem. If you want to score A LOT of renegade points you must wait for a renegade interrupt opportunity (first screenshot) and throw the soldier through the window. If you skip the interrupt you can prevent your enemy from raising an alarm (special renegade/paragon dialogue options) or let him go even after he's informed his colleagues about your arrival.

Make sure to find a datapad on the floor before leaving this area. Examining this object will allow you to activate a new side quest - Illium: The Assassin: Salarian Family Data. You may proceed to the next warehouse. Find a good cover and start eliminating enemies seen in the distance. You shouldn't have any problems with that, especially since you won't encounter any elite units here.

You can now open the left door (first screenshot) by solving a mini-game. Several workers are hiding inside and one of them will start aiming at you as soon as you've opened the door. You can choose a renegade interrupt to knock him out. Otherwise you will have to wait. Notice that you can convince him to stand down by choosing one of two special dialogue options.

If you've managed to calm down the worker you will have a chance to ask him several questions. Wait for the salarians to leave and then examine this room to find a med kit and 6000 credits (PDA). Proceed to the next section of the map. Once you're inside a new room you can interact with a radio terminal and collect power cells for your heavy guns.

Use a nearby ramp to get to the top and once you're there deal with a group of mechs. Once the machines have been destroyed order your followers to take cover behind nearby objects. You'll have to be careful here, because you'll be going against many Eclipse troopers. Watch out for their biotic attacks and always focus on attacking a single target.

Keep pushing forward and don't forget to use nearby pillars for much needed cover. After you've dealt with all enemy units explore the area to your left and you'll find a container with 500 units of element zero (first screenshot). You can also take a med kit and interact with a weapons locker if you need to. Save your game before moving any further.

It shouldn't take long until you get to the roof of the building. Immediately take cover behind the nearest object (first screenshot), because this area is swarming with Eclipse units. Start off by eliminating enemies standing above your position and finish by taking care of a mini-boss (Eclipse commando).

You may continue moving forward. Explore this entire area to find a dead body and to scan a submachine gun (first screenshot). Doing this will allow you to acquire a new plan for a research project. Keep searching to find a med kit and a PDA with 12000 credits. You may now start moving towards a large bridge (second screenshot) which connects both buildings.

You won't have to worry about any gusts of wind yourself, however you will be able to use them to your advantage. Notice that each time someone from your team uses a biotic ability which picks up an enemy the wind will do the rest and that person won't be given a chance to land back on the bridge (it will be swept away). There are mechs and Eclipse units here and obviously you'll have to get rid of them before you start crossing the bridge. Don't forget to take care of the rest of your team, especially if your allies can't find a good cover on their own.

Keep pushing forward. Once you're close to the other side you'll notice that rocket drones have activate themselves. Deal with all standard hostiles and then start RUNNING towards your destination to eventually find yourself under the turrets and out of their line of fire.

You may now use the stairs to get to the balcony. Be careful, because you'll probably encounter several Eclipse soldiers here and there's a chance that they'll be using cover. Deal with this threat and then take care of the second Eclipse commando. I would recommend killing this enemy at close range and with the help of the rest of the team.

You may click on the door which was being guarded by the commando. Don't worry, because you won't have to fight the mercenary leader. Thane will arrive here soon and take care of this problem for you. During your initial conversation with Thane you can praise what he did (renegade points) or you can inform him about your lack of approval (paragon points). Wait to be transported back to Normandy where this quest will come to an end.