Use the grapple and perform a wall run. When you get to the end, do a jump to the left and grab the ledge on the wall.
Do a back jump to the small obelisk behind you.
Jump from one obelisk to another and use the small ridges to get higher.
When you are high enough to grab the ledge on the opposite side, do a back jump to it.
Perform yet another wall run.
And when you get to the end you'll be able to reach the artifact #3.
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