[b]How do you open a vex portal? [/b][i] You have to stand on a vex sync plate.[/i]
[b]So I have an idea/theory:[/b]
[i]I think[/i] you have to go through a portal that hasn't been found/tried yet, and it will take you through the vex portal we see in the jumping puzzle to activate the chest, and once you go through it, the chest spawns in the tiny cave. So I think there is either a sync plate we haven't found yet(in the Gorgons lair), or it's in Atheon's lair.
[b]This is my crackpot theory: I[/b] am wondering if during, or after, the last fight you can open the portal from Inside.... Like go into Venus, then run like mad to the Mars/Past sync plate and open mars from Venus/Future. Has anyone tried this? I know it would be hard due to going blind, and i don't even know if they will even work, but I thought it's worth a try. It's the only sync plates we don't use...
[b]Go forth fellow Guardians! Explore the Vault! Search for a lone, long lost sync plate. [i]But Beware of the R.O.U.S.'s![/b][/i]
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In venus/ future side, as we all know is a replica of the vault its self, I have witnessed the gate opening from the area we enter from. Hobgobs (about 3) come out right as the last oricle is destroyed. My theory is if the outside crew can keep the gate open just long enough to bolt out, you're technically leaving the vault. In turn being auto clensed and free to dart to the usually broken gate. Perhaps one of the pillars down below would then have a sync plate which would open the extra gate. Just a theory. Sorry I dont have pics or video. Id love to try this theory out though!