Fish from the a school of Koalindl in the waters around The Temple of Life and get a koalindl. Examine it, decide it's too small, and throw it back and you get a koalindl scale key.
Take the key to The Down Below and find a small chest at -206, 0, -24 Copy . Unlock the chest to receive Seeress Ealaynya Ithis's Prophecies: Book Three and Temple of Life, a house item.
GU64 did not change this quest.