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If you put the trailer in slow motion you hear it better. But any way what do you think cortana says in the beggining of the trailer?I just found it today I will tell you what i heard after someone posts.
Techically, not Cortana. Been posessed, sorta. Noone really knows about that.
It is cortana talking with the gravemind (flood leader) thats what gives her the possesed voice see she actuallys says "I Have Defied Gods And Demons"