It's in the city, all of the enemy forces have teamed up.
You can have a fire team of up to 18, and you have to save the city.
Later in the fight, you fall back to the tower. An army of taken guardians come. It's an all out war for humanity.
Then, for the final boss, you fight a taken ahamkara on the top of the tower. Boom
English
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Sorry, kind of sick of the Taken, I'll be completely fine if they don't appear throughout the remaining duration of Destiny's lifetime... [spoiler]which may not be long :/[/spoiler]
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Element would be plasma