Part 7

Exit the building and head up the stairs to your left. Turn left at the top to find Cog Tag CT3.

Engage the enemies. Taking cover behind the small wall to the right of the exit door is recommended.

After clearing the enemies, head north. A Raiven will land, and a gate will fall, triggering a cutscene. This completes Chapter 1 of Act 1. If playing co-op, the 'Dom-Curious' Achievement should unlock.

Trial by Fire: After the cutscene, take cover behind sandbags. The incoming Locusts are likely dealt with by a chopper.

Head up the stairs and through the door. In the next open area, take cover behind the broken square wall.

Eliminate the appearing enemies. Use the chainsaw if they get too close.

After defeating the enemies, hop over the short walls to find Cog Tag CT4 on the ground in a small courtyard.

Proceed up the next set of steps. A short, unskippable cutscene will play.

Your teammates will instruct you to flank the Grubs. Take cover behind the first pillar (left of where teammates might hide), which has an ammo box in front of it.

Move around the pillar and engage any Grubs. Use pillars for cover if needed, but relocate if overwhelmed.

A Locust-hole may appear. Throwing a grenade into it will close it. This is optional but recommended if safe. On Casual, try plugging it. On Hardcore, picking off enemies from a distance with a Lancer is often easier. If desperate, fall back or attempt to plug the hole.

After killing the Locusts, head left of the Emergence hole to a collapsed pillar. Behind it is a box, and to its left is an open gate.

Use the small wall straight up from the opening as cover. Shoot enemies from afar, and use the chainsaw if they get close or attempt to flank. Dying here means restarting from the staircase.

Head north to a bridge. At the broken segment, press Y to see Cog bodies.

Wait for Kim to open the door. Inside, hide behind the first small, diagonal wall.

Shoot enemies, who often hide behind pillars. When an Emergence hole appears (marked by a collapsing statue), run to it, plug it with a grenade, and quickly return to cover.

After eliminating all enemies, head north from the first Emergence hole, around a pillar.

Try to plug the next hole by hiding behind a short wall. Remain there, using the pillars behind you for cover, and eliminate any remaining Locusts.