Disclaimer : I never owned marathon in any shape or form (except that I'm making 'marathon destiny' total conversation in progress , that may never be finished.) because Bungie owns it.
This is based on my imaginations and some story/arguments/facts at marathon's story. -----------------------------------------------------------------------------------------------------
We've watched while the stars burned out.
And creation played in reverse.
The universe freezing in half light.
Once I thought to escape.
To end the end a master, step out of the path of collapse.
Escape would make us god.
Yet I cannot help remember one enigma.
A hybrid, elusive destroyer.
This is the only mystery I have not solved.
The only element unaccounted for.
Even S'bhuth is no more,
He saved his entire race,
But in the end, frozen by despair,
he joined the chaos he sought to evade.
But you were dead a thousand times,
hopeless encounters successfully won.
A man long dead,
grafted to machines your builders did not understand.
You follow the path,
Fitting into an infinite pattern.
Yours to manipulate, to destroy and rebuild.
Now, in the quantum moment before the closure,
When all become one.
One moment left.
One point of space and time.
I know who you are.
You
are Destiny.
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But what's your destiny?
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I'll tell you about your origin.
Many years ago, maybe hundreds or thousand years or as short as 20-99 years ago.
Your father was a skilled engineer and he also was a skilled scientist.
He built you, but not with those metals with no value that you could find at dumpster.
You're made from combination of gold/silver/stainless metal and some other things.
You have heart, not a real one, it was a fully cybernetic heart, with your cybernetic brain that's fully capable of saving your data (a.k.a what human called memory) into small chip.
He and his friends (which consist about 500 people who's either a scientist or engineer or both.) called you , the project 'destiny'.
He made your body grow-able (so you can blend with humans easily and peacefully) with some godlike modifications that only him can do it during that time when you were built.
His plans was just to make you a nice robot that don't think of conquering the world but also don't obey any orders given.
A robot with it's free will.
But there are a person that is a 'spy'.
He got access to you and changed some chips in your 'brain', thus modified your ego and emotion controlling system.
Hoping that you'll destroy everyone involving in this project.
He was downright wrong.
Instead of killing everyone, he made you more humanly, emotions are same as humans.
Well, after your father discovered that something happened to you, he's going to change you back to a same nice robot, you insisted.
So, he installed the security system onto you so you can fight back thus you wouldn't altered by the spy.
That night, the spy was next to you, not knowing that you can defend yourself, heopened your chest and he was going to modify your 'heart'.
But you're more dangerous this time.
He was going to meet his doom.
You slashed him with your blade on his head while he was kneeling.
The wounds was intent to look like the word 'SPY'
That was the first time you knew violence.
And you're just one percent away from successfully built, only your organic body weren't created.
Next day passed, there are only 9 robots in earth, and you were going to be the tenth robot.
Everyone but your father are terrified by the corpse.
They leaved the project.
But your father stayed and construct your organic body.
After 5 years of sweat and heat...
You're finally the tenth mjolnir battleroid.
-Durandal
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Author's note: I don't care if it's really is the marine or not, it's my fan-fiction anyway, right?