The Catastrophic Rain is an incident which happened after the death of dragon Karas during the Black Dragon Raid. It is said that the blood of the fallen dragon rained down on the soldiers who fought during the Black Dragon Raid, contaminating a large area of the Lonely Forest Path, along with regions of Black Mountain. Those exposed to the poisonous blood acquires a sickness that was later discovered to have the ability to mutate its victims, turning them into monsters. Among its victims were three members of the Six Heroes: Nerwin, Karacule and Barnac.
Heraldry Scholar Stas later investigated on this incident and allowed a deeper look into the causes and effects of the Catastrophic Rain.