The Seven Lost Gods is a term used to describe various groups of powerful entities at different times. Some of these entities might have been primordials, and candidates include Dendar the Night Serpent, Kezef the Chaos Hound, and Borem of the Boiling Mud. Faiths & Avatars has a little more on the Lost Gods of Westgate. It says that each temple is beneath one of the seven hills to the west of the city, topped with a ring of standing stones. The southernmost is the Hill of Fangs, formerly a temple of Moander.