This page explains how to find the Shee Venath shrine and solve the "Twin Memories" puzzle.
How to Reach the Shrine
It is easiest to go to Shee Vaneer Shrine first, then look north from there to see this shrine just below the peak of the northern Dueling Peaks mountain. Float there from Shee Vaneer Shrine.
How to Solve the Shrine
Read the sign near where you entered the shrine for a hint about solving it. Then go up the ramp and wait for the moving platform to come down. Get on the moving platform, then walk onto the platform up above. Look downward and make a note of which target holes have orbs in them.
Then from this upper area, float around to the other side of the pillar near where the moving platform stops. There is a chest there that contains a Serpentine Spear.
Then go to Shee Vaneer Shrine and make a note of the starting positions of the orbs there. Then come back here and move the orbs so they match the positions of the orbs in Shee Vaneer Shrine. When you do, the gate will open.
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Go through the gate and talk to Shee Venath to get the Spirit Orb.