Return To Elysia

You may have noticed that the Hoverplat Docking Platform area can be traversed with the Screw Attack earlier, but you'll also need the magnetic rail attachment for your morph ball to get the goodies there. You can, however, head to the top of the Construction Site area and jump on top of the structure with the grappling hooks there to find a Missile Expansion.

When you're ready to move on, head to the Security Station on your map (near the large arrows that are pointing off in the distance), proceed through the fire door there, and screw attack your way up to the top. Use your ball form's Hypermode attack to destroy the vines, then proceed on. You'll be able to use the tram here to visit…

Eastern Skytown

Move into the door here to avoid the Space Pirate's attacks. You'll come to the Concourse area, which will be a little hub for your travels here. Kill the Space Pirates, then move into one of the hallways and use charged beams to destroy the security shutters. Move up the elevator and find the path to the Concourse Ventilation area. Hop up into the bomb slot to release the grates below you.

The Chozo Observatory will be important after you gain the spiderball.

Eventually you'll come to the Chozo Observatory, where you will find a satellite that's almost ready to launch. You'll need to find some way to lift the launcher, though. For now, there's not much you can do here but drop down and access the elevator underneath the area. Repair the next lift to move on.

Gearworks

When you reach the gearworks, destroy the swarmbots and jump to the middle platform here. There's no way to reach the Missile Expansion just yet, so keep on moving into the Turbine Chamber. When you reach it, destroy the glass blocking you from moving on, then use charged blasts on the two clamps to your left and right. That'll open the path in front of you.

Keep moving on through Maintenance Shaft TR and Skybridge Athene to reach the Federation Landing Site. Land your ship there, then use the panel nearby to upgrade it with the Ship Grapple Beam.

Assemble The Bomb

Now that you can grapple objects, it's time for you to start assembling the bomb to destroy the Leviathan Seed. Head back through Eastern Skytown. When you reach the Gearworks again, a Space Pirate ship will destroy the platform you passed over earlier, but will allow you to access the Missile Expansion there.

Return to the Chozo Observatory and use the Command Visor to command your ship to pick up the satellite launcher there. While it hovers above you, drop down and repair the circuitry that gets exposed, then use the bomb slot nearby to repair the structure itself before dropping the launcher back into position. When it's back down, use the bomb slot again to raise the entire structure up a few levels.

You can now jump up to reach the Botanica, where a save spot is waiting for you through the door to the left of the first open area. You can also nab a Missile Expansion here by heading to the white door at the end, turning around, screw attacking your way to the platform in front of you, then moving around and screw attacking to the missiles.

Boss Fight: Berserker Lord

You'll come to another Berserker Lord at the end of the path here, when you reach the top of the Turbine Generator. He's not substantially different than he was when you fought him back at the beginning of the game, but he does have a couple of new attacks. When his shoulders are blazing, his lasers move more quickly; when you destroy the shoulder weak spots, he'll periodically rear back and send a powerful energy ball your way. Also, his Phazon shots that float at you are sometimes red; these can't be shot back at him, only reflected.

Apart from that, the same tactics apply here: shoot the weak spots on the shoulders, then aim at the black Phazon shots that come towards you and shoot them to rebound them into the Berserker's head. It'll take a long time before his head explodes, but when it does, switch to Hypermode and blast the brain to finish the beast off for good.