The M6 Spartan Laser also called the ‘Galileian’ is a shoulder mounted direct energy weapon. It is used by the United Nations Space Command (UNSC) to intercept and destroy vehicles. It is extremely accurate with a long range. A few set backs to using the Spartan Laser are:

One, it takes a short while to charge before it actually fires and, Two, the firing rate is limited to 5 shots only then it needs charging. Nonetheless, it is a very powerful weapon that is extremely helpful to anyone who wants to use it.
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There are a lot of weapons available when playing Halo 3. The weapons are placed in 4 categories and they are: Human, Covenant, Brute and a few uncategorized ones. Knowledge of these weapons is important so that you have an edge over your opponents.

Human Weapons found on Halo are pretty much just an improvement on the weapons that exist today, save for a few exceptions. This may be Bungie’s way of seeming more reality oriented – at least when it comes to Human Weapons. Some critics say that the Human Weapons in Halo lack creativity, because it seems hard to believe that after half a millennia, humans are still carrying around projectile riffles and bombs. No matter what your stand on Bungie’s weaponry design, the important thing is to familiarize yourself with them and make the most of what is afforded to you. Human Weapons work better on unshielded opponents. They are less effective when used to take down shields. Below is a list of the Human Weapons found in Halo 3:

Assault Rifle
Battle Rifle
Flamethrower
Frag Grenade
Missile Pod
Rocket Launcher
Shotgun
SMG
Sniper Rifle
Spartan Laser
Turret
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The Scarab Tank is a really strong force, if you have it on your wrong side. The tank’s head is armed with an extremely strong energy beam, annihilating anything that comes in its contact. Ensure that you stay away from this; even a little touch will harm you a lot. To dodge this, you should stay beneath or at the back of the scarab tank.

There is a positive side for you too though, as in Death Star, the Scarab Tank too has a weakness, which is the control room which is situated at the rear end of the tank. This control room can be destroyed easily, but reaching it is a tricky task.
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