In the Lith-Crillion Era, Felak's growing prosperity made it a target for hostile groups seeking a share of the prosperity. These raiders were primarily fomorians, Derro, and troglodytes from Glimmerkrim. Apart from these minor incursions, Felak enjoyed relative peace for three centuries. This tranquility came to an end when adamantine mining around Khuzir awakened a trio of ancient dragons, known as the Reds of Kilth, who were second-generation offspring of Tiamat's Clutch. These formidable beasts attacked Felak, accompanied by armies of fomorians, Derro, and troglodytes. The conflict spilled onto the surface, with Ilagandam and Tholig-Mizin joining the fray. By the end of the Kilth-Deeps War, Felak and its sister cities were either under dragon control or subjugated by their fomorian overlords.
