What should have happened was final assault was just like regular vex offensive, but after killing the minotaur you go through portal to different location. There you take on the undying mind with completely different mechanics. The rewards for beating it have a different loot pool with new gear and weapons. Make users want to keep playing it.
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Exactly what I was wanting! How difficult would it be to make a Vex looking encounter and some new armour that doesn't look broken as hell (Garden of Salvation I'm looking at you).