Story
The Warding Feather is likely sealed inside Zumion Temple, and Zumion's Priests can tell you the precise location. Defeat nearby enemies and use Zumion's Mace to awaken the statues.
After completion (spoilers)
"Pilgrims, I entrust the holy relic to you." The Warding Feather is likely sealed inside Zumion Temple, and Zumion's Priests can tell you the precise location. You approached the fully restored statues and used Zumion's Mace to resonate with them. The statues finally awakened in full clarity. The three statue priests revealed the temple's location and the incantation to open it, entrusting you to return the holy relic to its rightful place.