Scarab Gun

"Think, MASSIVE FIREPOWER! For one level only."

- Frank O'Connor

The Scarab Gun is a Type-25 Directed Energy Weapon that looks like the normal Plasma Rifle but has the firepower of a Scarab's main cannon, hidden in the Halo 2 level Metropolis. It has unlimited ammo, continuous rapid fire, and it never overheats. However, if you fire this gun too close to your position, you will die instantly due to the immense splash-damage. It is dual-wieldable, just like a normal Plasma Rifle. The Halo 2 Scarab Gun is the most powerful weapon of the entire Halo series, causing more destruction than the Halo 3 Spartan Laser and even the Scarab cannon in Halo 3. Even on Easy difficulty, with shields, it takes a great of amount of skill to not kill yourself.

Other Scarab Guns
There are actually 4 Scarab Guns in Halo 2 -- two on Outskirts and two on Metropolis.

Outskirts Scarab Gun (1)

 * 1) On Outskirts with the Black eye and Sputnik skulls on, get a Rocket Launcher and grenades.
 * 2) Get in a Ghost and go to the highway tunnel. (Fun fact: if you go against the wall and out toward the water you can slip outside the map.)
 * 3) Go to the edge of the building and turn left. Now go boost forward until you get a checkpoint.
 * 4) When the checkpoint is activated, get out and aim at the ground. Throw a grenade, shoot the ground with a rocket, and, at the same time, jump.
 * 5) With an Overshield, you should fly up in the air.
 * 6) Hold X and you should (if in the right place) pick it up and land on the wall.

Outskirts Scarab Gun (2)
This one can only be reached by modding the game.

When the Scarab blasts a hole in the tunnel in Outskirts, try to get outside the tunnel before the Scarab stops firing. If you succeed, you'll see it in a blue cloud beneath the Scarab.

Trivia
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External

 * Video Tutorial