Ordinary Pebble (Boralus Maze)

This Ordinary Pebble is found at in a cellar in the hedge maze at Proudmoore Keep in Boralus. It is part of the Riddle of Baa'l.

The entrance to the cellar is hidden beneath a tree at. This cellar (of the three) is used as a hideout for a bunch of Off-Duty Cadets playing D&D.

Solution
... Next pebble is found at a cave on the northern cliffside of Western Watch in Drustvar