Enter the shrine and go to the end, where there is a barred off Antechamber, a dead Nali and a water vase. Collect the Clip and Flare, then read the inscription on the wall:
"You must have a keen eye, so that you may bathe in the sacred waters."
Hmm... return to the shrine entrance, where one of the pillars has a face carving sticking out from the main part of the pillar. Press it and the bars are removed.
The antechamber reveals Tarydium Shards and a pool containing Biterfish and a Super Health Pack. Collect the pack, and return to the clearing. Head for the door in the structure, and press the floorplate at its base to open it.
As you step inside you will be in an open-roofed passage within the walls. An empty pool is ahead, so step around to the left and take the passage on that side of the pool. Beware of the LesserBrute that charges you here. Continuing, you will pass an inscription:
"Only the purest of heart will pay homage to the God of The Good Lore Chizra"
Go to the end of the walkway. There are 2 Nali Healing Fruit here, and a Clip behind vases. You will be at the front door; the lever to the right opens it if you want to collect anything from the start area.
Return now to the empty pool area within the structure. Head to the door at the far end; it is locked. Inscriptions either side read:
"Wood must break free..."
"...For that will be the key"
First of all, you must open the door. A lever is mounted by a pillar behind you, so press it.
The empty pool now fills up. Not what you hoped, you think, but as it does so the door opens. Enter the room behind and take a right to complete the level.