Sealing Away the Book of Eibhil

• Talk to Asheron in his castle and get a book page
• Go to Neftet and enter the Deep Caves on the east side (20.7S, 8.2E)
• Run through the dungeon, seeing various cutscenes about the Prince
• Give the page to the golem at the end, he gives you a shard
• Return the shard to Asheron for the reward (30k lum first run, 10k subsequent runs)

Timer is 27 days.