Chapter 4: Omega Cannon

Shoot the platform switch on the small pillar to raise the platform. Then scan the Ceremonial Charms entry that's along the wall. Shoot the platform switch that's nearby. Then head through the orange force field that's near the Voldrums at the top of the room. Continue up the right ramp to find another platform switch to the left. Then go back down and around the other side of the platform to find a Missile Expansion. Head back into the main area of the room and use the jump pad to scan the computer at the top of the room.

Head through the newly opened door to go to the Crash Site. Scan the wall in front of you for the Structural Debris entry. Grab the key in this room before dropping down. Fall down and scan the blue icon for the Alimbic Pride 03 entry. Then take the artifact and proceed through the nearby door.

Return back to the Council Chamber and go to the top of the room where you originally scanned the Voldrums. Head through the corridor that's to the left of the door. Scan the computer to get a key. Fall down and use the jump pad here to reach the artifact. Then head through the door near the Voldrums to go to the Processor Core.

Scan the blue icon that's just to the left for the Alimbic Pride 02 entry. Use the platform that that scan is on to jump across the room and find an UA Expansion. Scan the processors at the bottom level of the room for the Lava Processor 01, Lava Processor 02, and Backup Processor entries. Then jump into the middle of the main processor and take the lift down to enter a small space. Then progress through the Piston Cave to find the last artifact.

Go through the small space that's near the artifact and then enter the Stronghold Portal in the next room. Progress to the room of the next boss. Scan the Cretaphid v3, which must be scanned now. The Volt Driver must be used to damage this version of the boss. After defeating it, grab the Octolith and start the evacuation. The only mandatory enemy is Spire in the High Ground. After launching Samus' ship, head to Arcterra.

After landing, drop all the way down and enter the door at the bottom of the room. Continue through the orange door. Take the left path and scan the blue icon for the Alimbic War 09 entry. Defeat the enemies to release the force field. Scan the icon to the right for the Seal Sphere 01 entry. Continue down this path to encounter the Arctic Spawn, which needs to be scanned now. After defeating it, get the Imperialist upgrade. Scan the nearby icon for the Alimbic Prohecy 08 entry. Shoot the red target to activate the platform, then head through the red door on the lower level.

Progress upward through the small space maze and continue through the red door. Take the left path to find an UA Expansion. Scan the icon right next to it for the Alimbic War 01 entry. Proceed along this path and enter the corridor to the left. On the ceiling you'll find the Gorea 03 scan. Continue along this path to find the Alimbic War 12 scan. Then go into the main area of the room for the Alimbic War 06 and Gorea 04 scans. Then scan all 3 of the spectral locks and shoot the red target to get a key. Grab the artifact and then defeat the Guardians.

Take the unlocked door and return back to where you got the Imperialist. Take the platform up and then use the jump pad to go up some more. Turn around and shoot the 2 red targets to deactivate the force field. Go into the area with the Psycho Bits to find the Oubliette 01 scan. Defeat all the enemies to reveal a key. Shoot the tall column with a missile to knock it over. Grab the key, cross the room, and scan the panel to shut down the turrets. Use the fallen column to go back to the first area and enter the gray door at the top of the room.

Progress along this path until you reach Subterranean. Shoot the 3 red targets at the top of the room. Then move along the left side of the maze and take the central lift down. At the bottom, head down the path to find the Alimbic War 04 scan and a Missile Expansion. Go down the icy corridor to the right to get the Alimbic War 11 scan. Proceed down this path and turn to the left for the Alimbic War 05 scan. Then scan and destroy the Alimbic Turret v2.7. Grab the key and then take the artifact.

Head back up the lift, defeat the Guardians and enter the Drip Moat. Use the morph ball to go along the ledge on the left wall. Then drop down to get an UA Expansion. Enter the nearby door. Fall all the way down and take the path to the left to find the last artifact.

Go back up the moving platform and into the second area of the room to find the Stronghold Portal. Proceed to the boss' room and scan the Cretaphid v4, which must be scanned now. After defeating it, return all the way back to Samus' ship and head to Vesper Defense Outpost.

After landing, head through the portal at the top of the room. Then drop down and go through the red door. Defeat the enemies in this room. Then head up the ramps. At the top take the corridor to the right into the room with the tank of Guardians in it. Scan the icons around the tank for the Seal Sphere 03, Seal Sphere 04, Oubliette 02, Oubliette 03, Oubliette 04, Oubliette 05, Oubliette 06, and Oubliette 07 entries.

Enter the corridor near the Seal Sphere 04 scan and scan the computer to restore temporary power. Scan that new computer and then grab the key that appears. Jump on the ledge of the column near the key to find an UA Expansion. Then fall down and grab the artifact. Defeat the Guardians and then grab the new key that appears. Go down and take the other artifact. Head up and go through the door at the end of the curved corridor.

Take the lift up and head through the first door. Take the path to the left and scan the central pillar for the Silo Levitator entry. After the cutscene, quickly follow the path and platforms up to the top of the room and scan the computer. Fall down and defeat the Psycho Bits. On the wall near the spawner you'll find the Alimbic War 08 and Cooling Vent scans. Then scan the computer below to release the force field. Fall all the way down to find a Missile Expansion. Go up the ramps and into the curved corridor. Scan the ceiling for the Methane Pipeline entry. In the room with the crystal you'll find the Seal Sphere 02 scan. Fall down to find the key. Follow the path to the left to find the Alimbic Order 05 scan. Continue to the left to find the Cryogenic Storage scan on the wall. Use the nearby small space to go back up the room and grab the last artifact.

Backtrack to the Stasis Bunker to find the Stronghold Bunker. Progress to the boss' room where you'll find another Slench. Get the Slench 4A scan while it hangs from the ceiling, this is the only time to do so. The tentacles and the Slench itself must be damaged with the . When the Slench comes down from the ceiling, scan it for the Slench 4B entry. After defeating it, start the evacuation. When you reach the Weapons Complex, you'll have to defeat a couple Guardians. Once you reach Samus' ship, launch it and go to Alinos.

After landing, take the portal to the left of the ship. Take the door to the left. Defeat Kanden and then take the door that's near where the artifact used to be. Defeat the Guardians in the Combat Hall. Then scan the icon near the entrance for the Alimbic Pride 05 entry. Scan the panel on the lower level for the Blast Shield entry. Head down the hidden corridor on the right to find the Combat Hall scan. Then scan the panel on the far side of the upper level for the Sniper Shield entry. Head through the door at the end of hidden corridor.

In the Alimbic Cannon Control Room, scan the 4 pillars for the Alimbic Cannon 01, Alimbic Cannon 02, Alimbic Cannon 03, and Alimbic Cannon 04 entries. Then step into the white light in the middle of the room. After the cutscene, return all the way back to Samus' ship. Launch the ship and go to Oubliette.

After landing, follow the path forward and enter the portal. Scan the 5 icons around the room for the Sealing Gorea 01, Sealing Gorea 02, Sealing Gorea 03, Sealing Gorea 04, and Sealing Gorea 05 entries. Take the door and then head through the small path that's just to the right. Go through the portal that's just to the right for an Energy Tank. Head back through the portal and then enter the large door. Step into the white light to find the boss' room.

As soon as the boss fight begins, get the 2 scans on the boss for the Gorea and Gorea Arm entries. Then turn around and scan the Trocra around the outer wall. The plates around the room must be shot in order. First, the yellow plate with the Volt Driver. Second, the green plate with the Battlehammer. Third, the orange plate with the Magmaul. Fourth, the blue plate with the Shock Coil. Fifth, the purple plate with the Judicator. And lastly the red plate with the Imperialist. Run around the room until Gorea turns red. Then shoot his shoulders with the Imperialist.

Once Gorea changes forms, scan him again for the second Gorea entry. Then scan his yellow eye for the Gorea Soul Sphere entry. Shoot the eye with the Imperialist. After Gorea changes back to his first form, repeat the fight strategy until he's defeated.

After being transported, scan Gorea 2. Fall down to the lower level, take the Omega Cannon, and use your radar to find Gorea 2. Use the cannon to deal damage as Gorea 2 transports around the room.