See if the omen stones have any useful information.
Commune with the omen stones, on the altar next to Haylis.
Speak with Haylis again.
Face Skalmos, the Grozmok!
Use the portal nearby to enter Brokenskull Rock: Glory to the Grozmok, and make your way through to Skalmos. You will not be able to kill him, just survive 60 seconds until Skalmos captures you. ( -1763, -968, 2638 ) Copy/waypoint -1763, -968, 2638
After you're returned to the Sanctury of Divine Unity automatically, speak to Seeress Ealaynya Ithis in the Sanctuary
The Seeress believes that there might be a way to repair the destroyed Vessel of Wisdom. She gave me a lead to follow, so I should see if I can gather what is necessary to repair the Vessel.
Find the spiritual Threads that the Seeress mentioned.
Note: There's several spawn locations. All the shinies can be found on the main island, however they also spawn on others. Looks like standard yellow shiny.