Ya know I've never thought of the "mars" portal as future, but you may be right. They are clearly not mars and Venus, they are past and future. Inside the portals are mirror images of the room you are fighting Atheon in. There is another chest. I know this is true. What triggers it, where it's located, these questions will eventually be answered
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I have had an argument with people about this. they didn't believe me that each side is past and future. they fought me that its mars and venus I have even tried to show them both sides are the same room as the vault. the whole vault is about time but I cant get people to believe me. so I just yell Jupiter and Uranus to be a dick lol.