need to realign these nodes to allow access to the roof.

Proceed into the hallway, fighting two Tactical Transfers and a Gunner. Grab the SMALL ARMOR VEST.

Enter the next room, defeat a Berserker and three Tactical Transfers, collect DARK MATTER CORES, and exit.

Follow the hallway back to the previous room, defeat the Iron Maiden, grab the LARGE HEALTH PACK to her right, and use the "Call Lift" button.

Ride the lift down and prepare for an encounter with five Tactical Transfers and three Gunners.

Navigate the room, heading left and up the stairs to find NAILS and two LIGHTNING COILS.

Backtrack to a console on the right. Interact with the panel by clicking the left or right arrow twice.

Return to Sledge and proceed to the next room, where two Sentries will attack.

Enter the room on the right, navigate around the fire to find a SMALL HEALTH PACK, four ARMOR SHARDS, SHELLS, CLIPS, NAILS, and a MACHINEGUN.

Go through the door and up the steps to computer panels. Click "Open Seal" to open the area ahead, where an Iron Maiden will attack.

Run back down and along the hallway on the right to find a lift. Ride it up.

Follow the hallway to a computer console that allows you to rotate eight reflectors. The goal is to direct a beam to the door on the other side. Use the following button presses: 6 twice, 4 three times, 5 once, and 2 twice.

Return to the lower level and rejoin Sledge. Proceed through the unlocked door.

In the next room, defeat a Sentry, three Tactical Transfers, and a Berserker.

Follow the path, dealing with two more Sentries and possibly a Tactical Transfer. A Light Tank will emerge from an elevator; destroy it from a distance.

Get on the lift and ride it up. Kill the Gladiator ahead, then find a SMALL ARMOR VEST and a HEALTH STATION.

Follow the hallway and enter the room the Gladiator came from. This is a circular control room with two Iron Maidens. Defeat them.

Locate the panel and click the "Lower" button to create a bridge.

Proceed through the unlocked door. In the next room, destroy two teleporters before killing the two Iron Maidens to prevent Strogg Marine spawns. Defeat the Light Tank with the Dark Matter Gun.

Enter the next room, go left, and walk to the back to find a LARGE HEALTH PACK and LARGE ARMOR VEST under the floor.

Go upstairs, check the crate for three SMALL HEALTH PACKS and four ARMOR SHARDS, then go through the door to join Sledge on the lift.

Activate the lift to reach the tower rooftop.

Exit the lift and grab the HYPERBLASTER.

Enter the room on the right, which contains Cougar Squad's remains and numerous items: two MACHINEGUNS, SHELLS, ARMOR SHARDS, a SMALL ARMOR VEST, a HYPERBLASTER, and ROCKETS.

Exit this room and proceed through the next door and hallway to another lift.

Ride the lift up to the rooftop. Face a Gladiator and two HEAVY HOVERTANKS. Use powerful weapons like the Rocket Launcher or Lightning Gun.