It's good to see people being interested in Halo's storyline

No one is bigger halotard than me though

So here we go:
"I have defied Gods and Demons
I am your sheild, I am your sword
I know you, your past, your future
This is the way the world ends"
Before I start to explain my thoughts about Cortana's words, let's go back to the end of Halo 2. The very end. After the credits, we see Cortana talking to Gravemind. Here's a part of what they say:
Gravemind: "I will ask and you will answer"
Cortana: "Alright, shoot"
Now why would Cortana, a human AI, want to co-operate with a flood lifeform (assuming Gravemind is a flood, he certainly seems like one). The answer is quite simple: Gravemind has control over her. How is that possible? Well think of this. When the Chief gets captured by Gravemind, who then
teleports the Chief into High Charity (Covenant City). How is it that a flood lifeform would have control over Halo's teleportation system? Simple, Gravemind must be a more advanced form of flood, or maybe a cross between flood, and some other more intelligent lifeform that is able to do such things. So he probably is also able to take over Cortana. Let's assume he is for now.
Back to Halo 3. I believe the reason Cortana's going rampent is because she's being controlled by Gravemind. Here's what I think about her words:
"I have defied Gods and Demons" - Gravemind may be talking about how he has defied the Forerunners, the ones who created the 7 Halos and how he has defied Reclaimers. Remember in Halo 1, 343 Guilty Spark calls the Chief "Reclaimer" and in Halo 2, the Covenant call him "The Demon"
"I am your sheild, I am your sword" - Cortana is with the Chief in most battles. She helps him in battle. She also protects him. She acts as his "shield" and "sword"
"I know you, your past, your future" - If you've read the books you'd know that the Chief is part of a military project called the Spartan II Project. Here Cortana is talking about how she has knowledge about the Chief's past because she is able to access the military records, and possibly she knows his future too? What could it be? Death maybe?
"This is the way the world ends" - This is probably hinting how in the end the Halos will be activated and will eliminate all lifeforms and end the world. Or it also maybe talking about how the war between Human and Covenant will end
That's my views of Cortana's words of mystery

Now about the giant structure:
- It's either "The Ark", an installation which can be used to activate all the Halos remotely
- Or it's another "Library" which contains the 'index' to activate the Ark, which is somewhere else on Earth maybe?
We'll see in 2007

I forgot to mention that in the possibly real, possible fake "Halo 3 Script" that was floating around the net, Cortana betrays the Master Chief
This post has been edited by MobiusVyper: May 10 2006, 05:27 PM