Gnomengarde

Gnomengarde was a tunnel network located in the Sword Mountains that was home to a small kingdom of reclusive rock gnomes famous for their magical inventions. In the late 15th century DR, Gnomengarde was ruled by King Gnerkli and King Korboz . The gnomes also looked up to and tended to heed the words of whomever was the best of their inventors, and at this time these were Fibblestib and Dabbledob.
Around the time of Phandalin's refounding in the late 15th century DR, Gnomengarde was home to twenty-two gnomes. A few years later, a mimic arrived in the settlement and developed a taste for gnome flesh, killing and consuming at least two of the inhabitants and nearly killing King Korboz. The attack shook the king so thoroughly that he went mad, imprisoning his husband and himself inside their bedchamber to wait until the shapechanger either grew bored of eating their subjects or was driven off. Around this time, the Townmaster of Phandalin, Harbin Wester , made overtures to the gnomes for magic items.