Yes, they are a quest from Dragonspyre. A magical staff was broken into nine pieces and hidden in chests throughout the spiral, to keep it from falling into the wrong hands. You have to retrieve the pieces in order to.... Well, you'll get there! 8)
I have done all the mossback quests in Cave of Solitude, Kisbibe Village, Shirataki, and Ancient Burial Grounds and I still can't get access to Ancient Burial Grounds for the obsidian chest. I also saw a message you have to fight crazed forest spirit which is given to you by Mossback. I cant remember where that was. Did I miss anything? Allison Mythrunner, Level 49, Life. Followup: I just found a Mossback I missed, I finished the obsidian in Mooshu and now I only have Labyrinth to get.