Ah, mountains! A classic adventuring locale ever since Tolkien through a big wall of them right in the way of Thorin & Company! The Realms also has its fair share of legendary mountain locales - the Spine of the World and Mount Hotenow pop up often in adventures, novels, and other Realms products, so it's nice to have some focus on them here. But you best believe my eyes focused on "the Walls of Halruaa", and here was a section I greedily gobbled up after the hints of Halruaa's return in the Sword Coast Adventurer's Guide. The nation of wizards remains mostly a mystery, however, which is probably as it should be, but there's a lot of good lore here answering questions about what happened to all the damage wrought by the Spellplague when Halruaa returned. Great reading!