More:Halo 2: Missions: Sacred Icon

From GameWinners

Contents 1 Mythic Skull 2 Carbines with extra rounds 3 Needlers with 495 needles 4 Room of death

Mythic Skull

Play the level under the legendary difficulty setting. There is a semi-outdoor area which has the same type of area directly next to it. There is a large Sentinel in front of each one. Go past this area and down the piston. You will be in a vary dark and dank Flood infested area. There is a stack of six or seven boxes as you enter the room. Use them to jump up to the landing above. There are a handful of alcoves on the right-hand side. The skull is in the third alcove, floating above a dead human Flood. Enemies will have more health after this skull is collected.

Carbines with extra rounds

As you go through the campaign level Sacred Icon, you will reach a room with a green beam of light going through the room (over a big pit). Fighting your way to the second room with that beam of light, there is a carbine at the far end beside the body of a Brute with thirteen bullets in the gum and 104 extra rounds. When reloaded, there are 99 extra rounds (the normal maximum capacity is 72 rounds with 18 in the clip).

After the room with the first carbine in it, after dropping down a level there is another dead Brute in the middle of the room with a carbine beside him. This carbine also has 13 rounds in the clip and 104 extra rounds.

In the room with the first enforcer (big Sentinel with a shield in front), go around to the left side and climb up a ramp to a platform with another dead Brute. This dead Brute also has a carbine with 13 rounds in the gun and 104 extra rounds.

Needlers with 495 needles

In the first fight with an Enforcer (similar to a big flying Sentinel with a shield), go in the tunnel under where you entered the room. Under there are three Needlers, along with a few dead Brutes. Each of those Needlers has a total of 165 needles. Dual wielding these any two results in 330 total needles in your guns. Make one Needler a primary weapon then switch to your secondary weapon; then make a Plasma Rifle your secondary weapon, and dual wield a second Needler. To finish it off, walk over the last Needler and switch your Plasma Rifle for it. This results in a 405 extra needles, with 495 total needles.
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Room of death

As soon as you start the level, go down the piston (the long slide) then immediately go down the next one. When you are in the room with lots of Sentinel-spawning machines, find the first one and destroy it. Next, look to the right of the one that just exploded to find an open doorway. Grenade jump up there (this may require the Sputnik Skull) and walk down the short hallway. When you get to the end, you will automatically die.