Get a sniper rifle and a shotgun. Then, go to the Blue base and face the big structure in the middle of the level. Go forward up the hill until you see two groups of trees with the structure in the middle. Walk between the two groups and look at the group to the right. You will notice that there are two trees with big glowing green things on them; they look like two big green warts. Look at the tree with the big green wart to the left. You will see that it is arched. Step back slightly, run, then jump onto the tree; this may require a few attempts. Be careful when climbing the tree as you may fall. Once you reach the top, turn around and you will see that you are even with the huge bar object that connects the Red and Blue base to the big structure. Turn back to the right slightly until you see a little platform that you can jump on. Step back as far as you can on the tree, then run full speed until you fall off slightly, jump, and land on that little platform. You can now walk/jump around up there. This is also a good sniping location when playing Capture The Flag, Slayer, Team Slayer, or Phantoms.
Go to the big building in the middle of the map. Look above the doorway. If it is not there, keep going around the building until you see it.
Get the beam rifle, then go to the Prophet statue. Get in his crown for a nice sniping location.
Go to the beam rifle in the back with a partner and swords. Go through the Blue teleporter and you will be outside. Turn to your left and walk on the small pole that is sticking out of the edge. Jump to the small slanted box and crouch. You will slide for a moment, then land on a flat surface. Have your partner do the same thing. Walk up it and sword cancel up to the roof (press R + X at the same time). Go to the edge and have your partner jump toward you and sword cancel. Go to the next wall and sword cancel over it. You are now past the map's boundaries. Walk straight to the end and hit the invisible wall. Then, walk left and fall. Lean against the invisible floor while doing so. If done correctly, you and your partner will be at the very bottom of the level.
Get the rocket launcher, then fire two shots very quickly at the Covenant sniper nest (the blue object on the gravity lift). If both shots hit at the correct moment, it will fall off the lift and you will be able to blast it around the level. Note: If you shoot it from the wrong side, it will fall into the water. This may require multiple attempts.
Locate either of the telporters in the Relic, but do not activate them. Once you have found one of the teleporters, stand on top of it and aim down so that your reticule is pointed at the very center. Jump up and as you begin to fall and you will be teleported to the other point. This may require a few attempts. This is very useful in CTF games.
This trick requires an overshield, a rocket launcher, and preferably a Warthog. Use the Warthog to push the small barrier by the shoreline up the left ramp next to the tower. Align the small barrier parallel with the tower at the top of the ramp. Then, stand on the bar sticking out from the small barrier and shoot the top of the small barrier. It will shoot you up to the top of the tower. Make sure to move closer to the tower as you are flying up. Note: This may require several attempts.
This trick requires an oversheild, a rocket launcher, and sword. Go to where the Warthog respawns (near the Pelican), then go to one of the shield-type things and get behind it. Start hitting it with your sword to the Relic point (straight ahead). This may take awhile, but it is worth it. When you get there and have the shield facing it, make sure it is slightly back up away from it. Stand on the support to the shield and use your rocket launcher on the top of it. You will begin to launch very high. When you start to launch, press Forward. This may require a few attempts. When you make it up there, you will be able to see all your opponents and you will be in lock-on range for any vehicle.
This trick requires a sword and a friend. Go to the tower in the middle. To the left as you are facing the crashed ship will be a ledge. Go to the ledge and jump on your friend's head to get on the sloped part. Then, have the person who is not on the slope sword cancel up. Do this by aiming at the opposite player and pressing X + R with the sword. After doing this, walk to the top of the slope. Walk on the flat part until you reach the end. Upon reaching the end, have one player jump on the others then perform a sword climb. Do this by having the player on the bottom press B + X rapidly and have the player on top jump repeatedly until you reach the top. As you climb up, move slowly to the left. When you reach the top, press Forward.
Have two people on Xbox Live fire rockets at the sniping nest at the same time and it should fall. Make it tumble into the water so that it disappears. Have someone in your party leave so you get to the "blue" screen, where it says "Setting up game" and reloads it. Once the game resumes, go back to the sniper nest, as it should be back. If you shoot at it now, all bullets will go through it, as if it was not there. However, players will still be able to stand inside of it without falling though.
Push a barricade into the rock near the teleporter, next to the large broken tree. Position it so that the part that you stand on is half way into the rock. Stand on the barricade, in between the rock and the barricade. Have three other players shoot the barricade to launch you into the air, just like on turf; sometimes you will get stuck in the ceiling. Note: It may help to be the Connection Host.
Go to the Blue base, then face the middle and look to your right to see the ramp going up in to middle base. Just before the ramp there is a big rock to crouch under. Turn out and go up the first and second part of the ramp, then stop. Turn to the left and from up above look at ground to find a little plant; jump on it to go flying. You can land in certain parts of the tree.
Find a turret in the Sanctuary and once you get to it, move away from it and throw a fragmentation grenade and it will disappear. Go up to the turret and "Click X to use the turret" will appear. You can now use an invisible turret.
On the second floor of the parking garage near the two doorways, there is a open vent if you look straight up. You cannot jump into this opening; you must take a Scorpion Tank and maneuver it into position under the vent. Then, jump on the main gun, then into the opening. You will now be on a balcony that gives you a wide view of the map. Make sure to destroy the tank upon entering to avoid sneak attacks. Also be careful, because this is a spawn point. Keep the sword or shotgun with your sniper rifle.
Go to the Blue base and go over to the corner where the "vine" is going down. Turn so that you are facing the vine or root. Make sure that the wall is to the right of you. Then, crouch walk into the root. Get up, run, and jump off the edge closest to the air vent. Once you land you should jump very high. Additionally, go to the Blue base. There will be a large tree with a root hanging down. Crouch down and walk under the root. Release your crouch once you are under the root, but do not stop pressing Forward. Walk forward into the root for about five seconds. Then, walk away from the root without releasing Forward. Walk towards the ledge which drops straight down to an alley near the shotgun and the airlift. Jump down while pressing Forward to the area near the ramp, teleporter, and shotgun. This may require a few attempts, but eventually it will launch you upward into the upper areas of the level. Sometimes it will only launch you up slightly, but usually it will launch you up quite high.