Covenant watchtower
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Summary
The Covenant use deployable lookout towers when they set up fortified positions to alert them of advancing forces and to give their snipers an elevated view of the the battlefield. In Halo 3, some have deployed plasma cannons in it.
They are basically a large platform suspended in the air by a medium-sized anti-gravity generator which is also used as a miniature Gravity Lift to ferry snipers and lookouts to and from the platform. In Halo 2, they appear in many campaign levels as well as the multiplayer level Relic. The only two problems are that it's suicidal to stay there for a long time and you must jump out of the window in order to leave the tower.
The platforms are capable of being knocked off the gravity lifts with rockets. This is achieved by firing two rockets at the corner of the platforms, or, if available, keep firing Gauss blasts at it. It will end up falling off, allowing you to float on the gravity lift.
In Halo 3, the platforms are destructible. Players also can destroy the fins on the top of the tower before destroying the entire tower itself. An easy way to destroy the platforms is to go on top of it, and throw a plasma grenade. (this is only advisable on easy or normal, as it may be difficult to do on higher difficulties.)
Dimensions Length: exactly 29 feet
Glitch
On all gravity towers that have been knocked down, the base is still active and can be used to push you up directly into the air. From this postition, you can continue to hover and snipe enemies. This glitch is absent from Halo 3; once the tower is destroyed, the gravity lift of the base does not work. However, the tower itself (if still intact) will push you through the hole in the center, as if the gravity lift was under it.
Trivia
With the length of the tower, 9-2=7, quite possibly another 7 reference.
