There was an angry battle between a child of Aproshol the Black of the N’dir clan and Na’grindl the Green of the Belw’n clan. This was in the early days of The Heedful Call (the third awakening/Third Age of Dragons), it was only the young ones which were fighting each other. The black dragon was hunting the green, and the two began stirring up the worst creatures of Dwindor Swamp and mountains of Scar Flow to fight for them.