Use the switch there, and then run towards the north edges shown on the above screen.
Get to the corridor on the bottom level (or you might just jump down).
Kill theLegion Soldieryou’ll encounter there, and use the opportunity to examine a nearby chest.
When you’re done, locate the time portal illustrated above and activate it withPhasewalker.
Go through the gate to go back to the present.
After jumping out of the portal, turn left, which is west.
Stop at the “regular” portal shown on the screen and activate it withPhasewalker.
Now, for a change, go east.
Stop at the edge, exactly where the screen shows, and activate the portal on the wall.
Go through the portal again.
Once you’re in the west corridor (on the bottom level), look around the area.
Locate the interactive ledges and handholds and move your way up.
You should reach a large gate leading to the north chamber of the Black Stone (screenshot 2).
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