Equipment changes the way that you will play Halo 3. Depending on which piece you have, it will provide a chance to explore new strategies, making you an adaptable opponent.


Flare

The flare sends out a radiant light, temporarily blinding all the enemies around it. Generally, unless it's the only item available, you shouldn't choose the flare over another item.
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Bubble Shield

The Bubble Shield places a barrier around the area where it is deployed. This barrier is impervious to all forms of damage, keeping those inside the bubble safe. However, attacks can't go outside the bubble.
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Energy Drainer

The Energy Drainer is effective only against shielded enemies or enemies driving vehicles. The Drainer takes down enemy shields with its initial burst, and then charges up and explodes, finishing them off. It can also stop any wehicle in its tracks (Like a charged up Plasma Pistol shot), including banshees and tanks.
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Grav Lift

The Grav Lift is a deployable jump pad, shooting you up into the air, giving you quick access to higher ground. It also works for enemies, which can be an advantage or disadvantage, depending on how you use it...
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Invincibility

The name describes it all: makes you invincible for a short time. A valuable item, indeed, use it for the direst of situations.
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Invisibility

Gives you a temporary cloak. Use the invisibility to pass large groups of enemies, or to sneak up behind them
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Jammer

Available only in multiplayer (And sometimes used by Brutes in Campaign), the Jammer jams the radars of your opponents, making fake targets appear on enemy radar. It's particularly useful to opponents who are trying to get close to their enemies in order to steal the flag or to execute them. Unfortunatly it also affects you.
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Portable Cover

The Portable Cover is a shield device. When deployed, it absorbs all shots (Including Melee) taken. However, if hit enough times it will vanish, but reappear later, unless the spawner is destroyed. Watch out for rockets!
-------------------------------------------------------------------------------------------- Trip Mine

When deployed, this mine will explode whenever anyone or anything touches it.
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Regenerator

The Regenerator does the opposite of the Power Drainer; it charges shields. Like the Bubble Shield, it radiates out a small field, recharging the shields of anyone who is within it -- friendly or otherwise. Use these whenever you or your team is trying to take or hold a spot where you are outnumbered.
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Auto Turret

Similar to an immobile Sentinel, the auto turret is a deployable antipersonnel turret. Drop the auto turret in an area where you want to defend, and it will shoot at the enemy. Note, it can be pushed around meaning you can move it to a new area.