Story
The Life Essence might help you see the memories of the High Priest. Go to the Nornir Altar to see the High Priest's memories.
After completion (spoilers)
"Destruction Archons? You mean that legion under Empyrean Lord Zikel?" Urd said that you could use the Life Essence from Grisilla to see the memories of the High Priest through the scar on his body. You headed to the Nornir Altar to see the High Priest's memories. You were able to unlock some of the memories left behind in the High Priest's scar. From the High Priest's memories, you learned why his body was wandering Altgard and that a man named Reuben had fled from the Impetusium. You were unable to find out more about Zikel's Core, only that there might be survivors... Nemon was frustrated by the lack of detailed information. Urd proposed tracing his steps one at a time. You decided to learn more about the Destruction Archons first.