Metroid Prime/Chozo Artifacts

You now have every upgrade in the game, but in order to get to the final area you need to collect all 12 of the Chozo Artifact. They aren't actually useful until this point in the game, so you can get them as they become available or wait and get them all at once according to your preference.

Artifact of Truth
You can collect this artifact after getting the Missile Launcher.

Artifact Temple
Go to the Artifact Temple in the Tallon Overworld. (See the Missile Launcher page for directions.) The artifact is located under the central statue. Once you have this artifact you can get clues to the locations of some of the remaining ones by scanning the other statues. You'll be able to scan all the statues after getting more artifacts.

Artifact of Strength
You can collect this artifact after getting the Space Jump Boot, though you can save yourself a trip in getting a Power Bomb Expansion if you wait until getting the Power Bomb.

Monitor Station
Go to the Monitor Station in Magmoor Caverns. Follow the path up to the second level of the central structure. Proceed as if toward the door to Transport Tunnel A, but just at the end of the catwalk, stop and look up and to the Left. There is another platform within reach of a double jump. Jump up then turn around and look up to find a second catwalk. Jump to that and turn right to the third level of the central structure.

Activate the Spinner to lower the collapsible suspension bridge, jump to the ledge beyong the bridge and follow it to the door.

Warrior Shrine
The artifact is on the statue.