Sacred Icon is the tenth campaign level of Halo 2. As Arbiter Thel 'Vadamee, the player makes their way through a wall filled with Sentinels and Flood, ending in an open-air Sangheili encampment. The player must defend it successfully from the Flood onslaught before the next level Quarantine Zone starts. This is the first and only level where Kig-Yar are encountered as allies. This is also one of three levels with human enemies ever in the whole series.
Fade in on the interior of a Covenant structure.
'Vadamee watches as the Jiralhanae take Honor Guard equipment from the Sangheili guards. Some Jiralhanae fight each other for choice parts. As 'Vadamee ascends the stairs leading to the Prophet's Inner Sanctum, a pair of former Honor Guardsmen Sangheili pass by him, without their helmets and energy staves. 'Vadamee walks through a large doorway, past the new Jiralhanae Honor Guardsmen (one of whom snarls at him in the Anniversary) to where the Prophets of Truth and Mercy speak with Rtas 'Vadumee and two of his Special Operations Sangheili.
Prophet of Truth holds up a hand for silence
Rtas 'Vadumee and his Sangheili leave. He nods to 'Vadamee, who returns the nod. The Prophet of Truth speaks to 'Vadamee.
They turn to a large view screen of Installation 05.
They turn toward 343 Guilty Spark, who seems to have been suspended in a gravity beam.
Mercy triggers a hologram of the Activation index.
Fade to black, fade in on Installation 05. A Phantom flies toward the surface. Cuts to Phantom cockpit: Tartarus approaches from behind the Jiralhanae pilot.
Focus on 'Vadamee, zoom in as he speaks.
Cut to Tartarus.
Cut to 'Vadamee, who stands next to a Jiralhanae.
'Vadamee draws a carbine and readies it.
Cut to exterior panoramic view of Delta Halo's Library, with the Sentinel Wall in the foreground. The Phantom flies towards the Sentinel Wall and stops over a landing. A battle has been fought here recently, as evidenced by Aggressor Sentinel wreckage and Covenant bodies and blood on the ground.
'Vadamee drops from the Phantom, which then flies off. Behind 'Vadamee, an Enforcer rises up and slowly advances. 'Vadamee whirls around and fires three shots (seven in the Anniversary) from his Carbine, to little effect. Suddenly, the Enforcer is hit by a sustained burst of plasma fire and loses its right-back leg. The Phantom flies by, and the Enforcer chases after it.
In the first room, there are some Constructors repairing an entrance. If 'Vadamee destroys one, some Aggressor Sentinels will appear (if on Legendary difficulty, the Sentinels will appear automatically) and will only stop spawning if 'Vadamee destroys the Sentinel launchers that create them. He meets a frightened Unggoy Major, who recovers upon seeing the Arbiter
After 'Vadamee jumps into the passageways moving downward, and the first room, he meets another Unggoy.
After fighting his way through a corridor lined with Sentinel launchers and the dead bodies of Covenant troops, including Jiralhanae, 'Vadamee drops down a piston into a more open room. He finds a group of Unggoy and Kig-Yar fighting Sentinels. After he defeats the Sentinels and cuts off any more from entering, one of the Unggoy speak to him.
If 'Vadamee stares at the Unggoy long enough, or just waits around:
'Vadamee moves across a bridge to the next room. A constant stream of Constructors can be seen below the bridge passing through a conduit.
'Vadamee finds another piston and enters the tunnel, sending him downwards. An terrified Unggoy runs toward him.
Several Sentinel launchers open up, producing more Sentinels.
'Vadamee reaches another piston, and drops down to the shield generator.
An Enforcer descends from above.
'Vadamee destroys the Enforcer.
After 'Vadamee overloads (or pushes them to save ammo) the first three plug locks
Note: On higher difficulties, the dormant Sentinel Launchers in the room will activate and start spawning Sentinels.
'Vadamee overloads the last one.
'Vadamee activates the holo-panel. The Sentinel Launchers in the room all explode. The platform drops down and starts moving as the door in front of him opens.
Above, the bright-green shield surrounding the Library is fading away, followed by Tartarus's Phantom flying lower towards the other side of the wall.
The door of the approaching wall opens to another Enforcer, which begins to fire on the Phantom.
The Phantom retreats, followed by an attack by Aggressor Sentinels and a break-out of Flood combat forms.
Eventually clearing the area of hostiles, 'Vadamee jumps through the wide-opened door that several Sentinels used to enter the area. Fighting his way through Flood forms and Sentinels, 'Vadamee reaches a piston at the other end. After clearing another corridor of Flood and surviving an ambush of Pod infectors, he reaches another piston.
As 'Vadamee proceeds through the hallway below, his COM link picks up a UNSC transmission.
'Vadamee looks across chasm to see a squad of Marines surrounded by Flood. The parasites usually overwhelm and kill the outnumbered Marines. If any Marines do survive, they will fire upon Vadumee and any Sentinels present. Fighting his way through twisting hallways full of Flood combat forms, with occasional Sentinels and carrier forms impeding his progress, 'Vadamee reaches another piston. After traversing an open-air balcony full of battling Flood and Sentinels including an Enforcer, 'Vadamee activates yet another piston which takes him still deeper into the Wall.
'Vadamee fights his way through an area heavily saturated with Flood spores. Eventually he picks up another human transmission.
'Vadamee fights through another group of Flood and Sentinels before reaching another piston. He drops down a long tunnel which deposits him on a flat platform akin to the one he initially landed on. Nearby a Covenant Phantom is forced away by ground fire from several combat forms, leaving 'Vadamee to deal with them. He drops down another long tunnel and reaches the bottom of the wall.
100,000 Years War
With the assistance from fellow Sangheili, 'Vadamee defeats several waves of Flood.
'Vadamee crosses a bridge and through a tunnel, engaging more Flood forms and meets the Special Operations Commander, Rtas 'Vadumee.
Rtas 'Vadumee is interrupted by screeches of the Flood.
After the fight has gone on for a while, a Phantom descends from above, firing on any remaining Flood in the area. Fade to white.