Dwarves vs the Mindflayers

Military: War

In true dwarven fashion, they continued to delve deeper into the Underdark, fueled by a surge in nationalism as they repelled the elves from encroaching on their gods-given domain. Unfortunately, just as it's in a dwarf's nature to delve, so to is it their nature to unearth something that should have stayed buried.

Deep in the Underdark the dwarves found the hiding places of the Illithid, who did not take kindly to their refuge being disturbed. Cornered, the Mindflayers mustered every last thrall (including many duergar) at their disposal to chase the dwarves back to the surface.   The conflict lasted many centuries and resulted in much of the deeper kingdoms of the dwarves, including Kal'Eldrumm, being forever lost to them.