Samus' weapons
Samus' weapons | Missile locations | Universal Ammo Expansion locations
Energy Tank locations | Artifact locations
Battlehammer
The Battlehammer discharges heavy green energy projectiles capable of automatic fire (tap fire manually for a faster delivery rate). Use this weapon against electric-based foes, especially when they wield the Volt Driver. Every shot travels over a short parabolic distance before striking the ground so you'll need to aim higher to lob each blast further.
Found in: Vesper Defense Outpost (Cortex CPU)
Firstly, search for a small narrow tunnel leading out of the Weapons Complex area. Follow the tunnel along thanks to the Morph Ball to locate the Cortex CPU region. In here you'll also discover Missile VD.01 on your way through. Once you've secured the missile, work your way over to the left side of the tunnel where you'll discover a tall shaft filled with pulsating green laser fields.
See the small jump pad on the edge of the platform? Wait for the laser fields to disappear then quickly roll into the pad, watch as Samus launches up to an exit way up at the apex of the shaft. Roll through the narrow tunnel beyond past a scenic locale to discover a tiny chamber. Stand up and scan the central object in the chamber for your Logbook, then scan each of the four spectral switches surrounding it to summon forth your prize from below.
Judicator
Using a sub-zero energy core, the Judicator is capable of firing thin blasts of freezing ice. The projectiles can bounce off a limited number of objects when fired, and can usually either freeze or destroy most targets with a few hits. Use a charged shot to unload three ice projectiles simultaneously. Use this against magma-based foes and those wielding the Magmaul.
Found in: Arcterra (Ice Hive)
After you've opened up the large vault door in the Ice Hive, follow the path beyond to discover stone ruins where the Judicator awaits. It rests high atop a ledge above, so you'll need to climb around the region to reach it. Firstly, jump up and over to the wall lined with narrow tunnels. See the object nearby emitting a blue glow?
Scan this object to rotate a number of platforms above, making them suitable to cross. Quickly enter Morph Ball mode and bomb-jump over to the nearby moving platform inside the wall. Ride it up and roll along the catwalk, eventually reaching a motionless platform. As you roll atop it you'll be taken over to the second set of rotated platforms. Carefully roll across to the other side, then simply follow the path to easily reach your prize.
Volt Driver
This weapon delivers small but fast electric projectiles capable of travelling over long distances. Use a charged shot to unload a large bolt of electricity. Wield this weapon against foes utilising Battlehammer weaponry.
Found in: Celestial Archives (Data Shrine 02)
Once you've picked up the Battlehammer, return to the Archives and head for the Data Shrine 02 area. Once inside, you'll discover the central region of the area's sealed by four green blast-shielded doors. Simply breach one with a burst of the Battlehammer and head inside to face two rowdy Guardians.
Destroy both and hop atop the bridge structure in the center of the chamber to snag UA Expansion CA.02. See the small floating platform nearby? Jump across to reach the far wall and sneak through the narrow opening in the wall to find the Volt Driver awaiting inside a small alcove there.
Shock Coil
A Federation prototype, this weapon delivers a continuous stream of deadly electricity over a short-to-medium range. Hold the fire button to keep the weapon rolling, just watch your ammo as it'll slowly drain as long as the weapon's active. Use this against enemies wielding the Imperialist. Also keep in mind that after several seconds of use the Shock Coil's damage rate will dramatically increase.
Found in: Celestial Archives (Incubation Vault 02)
The Shock Coil lies in the depths of Incubation Vault 02. Getting there is going to take a while. From the Docking Bay, follow the route to reach the Attameter Artifact in Incubation Vault 01. Once you've scored the artifact, take the teleporter further down the bridge beside the incubation tank to reappear at the top of Incubation Vault 02. Go inside the alcove beside you and drop to the bottom of the chamber; at the base you'll discover this weapon waiting patiently.
Magmaul
This weapon lobs rounds of deadly magma which bounce along the ground upon impact. Fire up a charge shot to release a stronger blast, just watch your aim as the projectiles travel over a parabolic short distance. Use this against ice-based foes or anything wielding Judicator technology.
Found in: Alinos (Council Chamber)
You'll need the Judicator to start the journey to this weapon. Head to the High Ground area and look for a tall purple force field barring access in the corner (after dealing with any rival hunters or pesky Guardians). Disable the field and turn right, heading up the stone ramp beyond. Destroy the turret firing at you from above and emerge onto a balcony overlooking the main area below.
Scan the visible switch nearby to summon a moving platform, of which you can ride across to the purple door beyond the drop. Open the door up with the Judicator and proceed through. Follow the path to eventually reach the large Alinos Perch canyon. Take apart the trio of Guardians ambushing you here to unseal a door at the base of the canyon.
Head inside to find a large lava lake around the corner. Step to the edge to awaken a Fire Spawn from the fiery depths. Unload your Judicator into its weird face when it opens, just take cover and watch for flying blobs of lava. Finish this beast off to reveal the Magmaul awaiting you atop a stone perch.
Imperialist
A precise and deadly piece, the Imperialist fires a long pinpoint laser beam with incredible range. With the weapon selected, double-tap the red icon or press R to zoom in, giving you a perfect sniper advantage. You'll need to be accurate though, as each shot comes with a few seconds of cool-down time. Wait till you hear the weapon charge up and hear the cocking sound before firing again. Use this against any foe from a distance, or against those wielding the Shock Coil.
Found in: Arcterra (Fault Line)
Once you've scored the Magmaul, head to Arcterra and proceed to the Sic Transit area. In the very corner of this area you'll discover a door sealed by an orange blast shield. Use the Magmaul to break through and find the Fault Line region beyond. The first cavernous area's filled with a number of Quadtroids, destroy them all to lower the force fields barring access outside.
Step outside to greet an Arctic Spawn who's not very happy to see you. Scan it then unload the Magmaul into its weird face when it opens to inflict damage. Rub the touch screen if it manages to freeze you. Upon yielding, your prize will appear beside the red blast shielded-door ahead.
Omega Cannon
This weapon may very well be the ultimate power alluded to by the Alimbic Order. They say its very use is harmful to the wielder, but when you've got a nasty monster floating about throwing meteors at you capable of moving through solid objects, there's not much else you can do. Use this against Gorea's final phase, each blast will cause the screen to flash so don't get disoriented.
Found in: Oubliette
MAJOR SPOILER!!!
The Omega Cannon awaits you in the final chamber during the second Gorea battle. You'll need to complete the Alimbic spectral sequence during the first battle to reach the second, then find this ultimate weapon awaiting you at the base of the elaborate chamber (step towards it and the shield protecting it will automatically lower). Check the bosses guide and walkthrough for more details to unlock the final Gorea battle.