At the Dog Pond, walk through the water and wait for Meldrida Slate to walk out and follow her to the crumbled wall she attacks at -137, -47, 541 . Kill her and loot a Mysterious Rune Stone.
This article refers to events, personae, items and activities that were involved in the Void Storms World Event, which started with GU46 and ran until The Shadow Odyssey went live. The event has now concluded, but this information is retained for historical purposes.