I haven't figured out who to ask to translate the demonic runes on the stone slab. It would be cool to extend that quest line. Several NPCs could translate the slab. Of course that would require finding another item for the fisherman. On a related note, is there a plan to make more use of the fisherman and his shack? It seems like a place where items could be bought or sold, a bait shop that also includes beachcomber items and oddities.