I don't recall the end being all that challenging. The room with the elite running for the banshee though (where you have to disable some energy balls with 2 banshees flying around)... I died in that room so many times lol. Also waiting for Cortana to unlock the door in the jungle while the Prometheans attack you.Hope you enjoy getting your ass handed to you by Promethean knights at the end, as much as I did!