Conrad Edison and the Broken Relic (Overworld Arcanum, #3)

FOREVER BROKEN

When Conrad learns of an ancient artifact that might be able to reverse death, he dares to hope it might return Cora from the grave.
The Broken Relic, however, is highly sought after by collectors though nobody knows exactly what it is. After being kidnapped, chased, and nearly killed, Conrad realized he and his friends will be lucky to survive the preparations for the quest, much less the quest itself.

But the Seers, an organization that gathers prophecies, offers him a dire warning: If he seeks the relic, he may doom the Overworld.