The Campaign - Sentinel Prime

Descend the stairs and follow the linear path, collecting the Codex entry.

Continue down, enter the door, and interact with the device to use the elevator.

After the cutscene (a non-interactive cinematic the game plays automatically), collect the Codex entry in plain view.

Follow the path into the next chamber and collect the Codex entry.

To the left, you will find a full armor set.

Pass through the door into the next chamber.

Follow the path, and just before the ledge, turn right to find a Codex entry.

Climb up, turn right, and climb up again.

Look to the right and jump across to the ledge.

On the other side, look left for another Codex entry.

Turn right and interact with the device, then look left.

A piece of the wall will move away; jump or dash over to it to find a 1-Up.

Head back and down the hallway on the opposite side, towards the blueish light.

In the next room, the Hologram will begin dialogue. Turn right and grab the Auto Map-Station.

On the lower path, on either side of the staircase, there is a Codex entry on the right and an armor item on the left.

Head up the stairs.

At the top, turn right, climb the stairs, and follow the path, turning right again at the end.

On the other side of the room, you can double jump or dash to a Suit Perk Point.

Grab the Suit Perk Point, look right, and grab the 1-Up.

The gate will raise, allowing you to exit. Turn left to progress further and grab the Codex entry on the left.

Activate the device on the right; the elevator will raise.

At the top, turn around and grab another Codex entry.

Walk down the tunnel, noting the caged Demons.

At the end, before the gate, look left for armor and ammo, and on the right for health, ammo, and a Codex entry.

Enter the gate.

After a cutscene, you will fight the Gladiator.

Phase 1 (Shielded): Keep the Gladiator in your sights with a fast weapon (e.g., Plasma Rifle) and strafe left or right. When the eyes on his shield glow green, open fire and dash left, continuing to fire. Whittle him down this way. His attacks include spiked clubs on chains extending forward, red projections from his shield, and a small area-of-effect (AOE) attack if you are very close. He will spawn fodder and occasional Heavy Demons like Prowlers or Hell Knights.

Once his health is depleted, attempt a Glory Kill. This destroys his shield and restores his health for Phase 2.

Phase 2 (Unshielded): Use rockets locked onto him or BFG ammo for significant damage. His attacks are similar, but he will also jump and slam his clubs down. A new attack involves slamming both clubs down in a V shape in front of him, which you cannot pass through. Shoot him in the middle and jump or dash to avoid the energy arc between the chains. He will also spin his weapons in a yellow shield that reflects your weapons back at you. Be patient, stay locked on, and fire when he lowers it. You can now Blood Punch him.

Perform a Glory Kill on the Gladiator to defeat him.

After a short cutscene, the chapter ends.