Cortana (level)

Cortana is the eighth campaign mission of Halo 3.

It takes place in a Flood infested High Charity and is involved with the Index from Installation 04.

Upon completing it on the Normal, Heroic, or Legendary difficulties, the player will earn the "The Key" achievement and 40 Gamerpoints.

A curious note to add to this level is that if you listen carefully, Cortana will say some quotes by Dr. Halsey from Halo: The Fall of Reach. Also at the end she says something she says in the original Halo at the beginning of the game. She tells the chief to keep his head down, that there are two of them there now. She says this in the first level of Halo if you lose a bar of health.

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Rampant
Gravemind: Child of my enemy, why have you come here? I offer no forgiveness. A father's sins passed to his son.

{Sometime later}

Gravemind: Of course, you come for her. We exist together now. Two corpses, in one grave.

Cortana: A collection of lies! That's all I am! Stolen thoughts and other's memories!

Gravemind: And yet, part of her remains.

Hell Nor Fury
{Near the end of the level}

Cortana: I'm picking up a friendly tag. Who would be crazy enough to come here?

{Chief and Cortana find the Arbiter battling Flood with a Flamethrower.}

Cortana: You two made nice?