Solution

On the right path, decline help from Statice. Ignore the coffers, then pull the lever to descend.

Description

“We arrived at a place that looked long abandoned but retained an unmistakable air of divinity. Whatever gods watched over Aloalo, this was surely their home.”

Matsya's description called to mind Thavnair's Purusa, and Kalika confirmed that it was indeed a sacred site for the people of Aloalo. It contained a ritual chamber where figures of the gods awaited to dispense their blessings, among them that of a sea turtle. As a fisher, Matsya is bonded to the sea, and Kalika suggested that he perform the proper rites before the turtle upon his next voyage. For Matsya's sake, I shall record the instructions here.

First, standing before the turtle, one must chant, “O wayfarer of land and sea, hear me.” Then the supplicant must journey around the isle of gods twice, each time passing the sparrow then the whale before returning to the turtle. Bow before the wise traveler to earn its blessing.

Figures of the divinities could also be found throughout the ruins of old settlements, and I wonder whether their arrangement held special meaning. Regardless, it is plain that religion was of great importance to the people of Aloalo, much like it is to the Hannish.