A magical lantern at Gulpax's Workshop used for interplanar travel.

“This is the instrument of a god, not some mortal's plaything.” - Kethra - Ascending Kethra's Steppe (GS-ADV4)

Searching through scrolls in the Temple of Shintal, you find an interesting sketch.

Someone has also scribbled a few notes: “Lantern of Wayward Souls. Gulpax’s Workshop. Secure at all costs.” - Festival of Heroes (GS-ADV1)

The Immortal Knight gives you and Nayo a seemingly difficult task.

“Travel together. Find and open Kethra’s Door. Gain her help in retrieving the lantern from the Order of Assassins. Until you do, none of us are safe.” - Imbri - The Hive (GS-ADV3)

While exploring the lands near Redtooth Peak and Goldbelly Mountain, you are caught by surprise by a would be assassin. A wiry Hobgoblin appears seemingly out of nowhere brandishing a dagger in one hand while holding the Lantern of Wayward Souls in the other. Before you can react, he is gone in a flash. - (GS-Guide- ADV4-26)

You once again encounter the assassin at the top of Kethra's Steppe. Nayo leaps through a portal to aid her friend Zug while Kethra pulls the Lantern of Wayward Souls from the grasp of the Hobgoblin.

You will be put to the test by Kethra. If you are strong enough, you may claim the lantern for yourself.

You find a hand drawn picture of the lantern in Gulpax's journal.