DAWNING SPOILERS AHEAD LADS!!
In the NEW Nexus Mind, the dialogue states that the Vex have built the Nexus again, but this time, they have outfitted it with a tougher Chassis and tech from the Vault of Glass. At first, the Vex could only bring the teleporting platforms out, but now?
This proves that the Vex are learning, taking things from the Vault and implementing them in the real world. It is only a matter of time before they bring in Oracles, and then we are -blam!-ED.
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They can't actually do any of the stuff that they do in the vault of glass in the real world. they can take real physical things out but if you took say the gorgons out they would just be weird looking harpies. They wouldn't be able to erase you from time. The vault is their attempt at making a throne world and like with Oryx's or Crota's they are only that powerful in their worlds. thank god because if we had to fight gorgons on a daily basis the game would be impossible. [spoiler]also shouldn't you know this stuff Mr. Atheon? ; )[/spoiler]
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Sure they will be re skinned and sold to us at a bargain price of 30 bucks with the vex mythoclyst coming back in april/may and watch every one wet themselves like they are over IB don't worry about piss poor pvp lack of content or story who ever does the marketing at bungovision should get a raise
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You fail to mention the fact that vex from the future are completely capable of coming back and killing us without the Vaults power.