| C | Iitem | C | Item |
| Assault Rifle Piercing | M-25 Hornet | ||
| Recon Hood | Securitel Helmet | ||
| M-76 Revenant | Pistol Barrel | ||
| Sniper Rifle Barrel | M-358 Talon | ||
| Pistol Piercing Mod | Sniper Rifle Piercing |
You'll get a message from Thane saying that the Citadel is being attacked. Go heavy Overload and make your way there. When you land, you'll be under attack by all manner of Cerberus Troopers. Make your way up the right side of the area and then come down to the door at the back. When you get there, the enemies will stop respawning. Just keep an eye out because the enemies are quite aggressive and can hit you from a lot of angles you wouldn't expect them able. Of note, watch out for the many, many Centurions and Engineers in the area.
Once the area is clear, talk to Bailey and he'll take you into C-Sec HQ and tell you what's up. Inside the HQ, go through the next two doors. You'll come to a ruined lobby area. Kill the Troopers in the lobby area and then watch for the Guardians and Engineers coming down the stairs. Go up the stairs and you'll come to a reception area. A couple of troopers will drop down so take cover. They shouldn't be a problem so kill them and then search the room. On the right side should be a Med Kit and Assault Rifle Piercing Mod on the table. Examine the corpse near the table and then leave the room by bypassing the door.
You'll enter a room with sprinklers going off. You'll have an unaware Engineer to your right. Kill him and then take cover. A Guardian and Centurion will come down the main hallway. Just off to the left on a table next to a couple of crates will be the Recon Hood. Not far from that will be a bathroom with the M-76 Revenant next to the sinks. There are also some Credits in one of the lockers. Check the corpses nearby if you like. Leave the bathroom and make your way through the room with the sprinklers. As you go to leave the room, there will be a Med Station just to the left of the door.
In the hallway will be a couple of Cerberus in a side room through broken glass windows. Take out the Engineer first and then the other. Check the nearby bookcase for the Sniper Rifle Extended Barrel. Activate the Elevator Door in this room and then go back into the hallway and out. Use the Elevator to go up.
When you get to the top, you'll come to a hallway with rooms on either side. Enter the right side room and pick up the Pistol Piercing Mod next to the computers. In the main hallway next to a body will be the M-25 Hornet. If you go up to the rooms on the left, you'll find a Pistol High Caliber Barrel and the Securitel Helmet in the room on the right. If you go to the left doorway on this side will be the M-358 Talon and a Datapad. Go back to the hallway and in the last room to the right will be the Door Controls and a Computer with credits on it. Open the door at the end of this room.
You'll come to a hallway with a couple of Cerberus standing around. Killing them and go through the door on the left side at the end. In the next room, check the kitchenette to the right and grab the Credits on the counter. Just after the end of the counter will be a Med Station against the wall. When you make your way into the room proper, you will be ambushed by Assault Troopers and a couple of Centurions.. Retreat to the kitchenette for good cover if you need it. In the second desk area, in the corner will be a Sniper Rifle Piercing Mod and near the closest door will be a Med Station. You won't be able to leave the room except through the door by the Med Station. Go up the stairs and through the door at the top.
When you regain control, you'll be on a balcony. As you make your way along the balcony, you'll come across new Cerberus Troops called Phantoms (as well as the Nemesis if you haven't already encountered it). Strip their barriers and hit them with a singularity. Try to kill them quickly because they will use jets to right themselves and escape the singularity. Once they do, they'll turn invisible and run away to regenerate their barriers. This makes it crucial for you to kill them if you decide to attack them.
Kill your first phantom and the Troopers that accompany it. Continue along the balcony and jump the gap. You'll come to an area with a bunch of parked vehicles. You'll fight a Phantom up close and some Troopers/Centurions in the distance. Lure the Phantom into the area with the parked vehicles so that you can have some space to fight them. Take them out and then kill the assorted Cerberus Troops here. Run to the end of this Balcony and then enter the maintenance area beyond.
In the maintenance area, when you have to vault up to a higher level, turn left to find Credits on some barrels and then continue to the right. You'll return to the balcony and have some room to fight a few troops. An Atlas will also drop down though so you may want to retreat so that you have decent cover. Drop it's shields with a bunch of overloads and then hit it hard with a focused attack of heavy weapons and warp. Once it's dead, go up to theCouncil Elevator at the top of the stairs.
You'll get on the top of an elevator. As you come up on elevators, you'll have to shoot the power conduits under them. This will stop their elevator and you will pass them. When you come to the second Elevator, try to kill the phantoms quickly because in this tight space, they can be dangerous. After you drop the third elevator, a couple of troopers will drop onto yours. You will be able to jump onto the fourth and final elevator.
During the following cutscene, you'll have a Renegade Interrupt that you might not be able to ignore.
Spoiler:
| Whether you take the Renegade Interrupt or not, Udina will be shot either by you or by the person who was just guarding them. |
