Skulls, Bones, and Runestones

Location info Level Required: Any Location: Yulgar's Inn Monsters and NPCs Monster Generation: Monster List: Bone Terror NPCs: Ulfgar Geirsson Required to Complete Quest Turn In: Velanda Runestone x1 Rewards Total Experience: 650 XP Total Gold: 650 Gold Total Reputation: Equipment Won: Notes: Must have completed Thor's Fishing Tale

The Gosforth Runestone! Well done, hero! Let's see... "Underneath the battlefield, worry not about the restless dead, but the beast of bone and terror..." Could this be referring to Battleunder? Is there something down there that's worse than the hordes of undead?