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It won't help get out of the portals and he has to go fully through the VoG.
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He can teleport from planet to planet... why would the portals be a problem for him?
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He's stuck in the past, he can't teleport through time.
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It teleports you, but not through time
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Between Venus and Mars one is in the past and the other is the future. Pay close attention to how the vex look, and compare it to grimoire. One is from the past and one is from the future. I'm at work or I would say which is which