Draco Holy War

Dragons nearly killed themselves into extinction. This allowed smaller folk to thrive.

Bauhaumt's gifts to the world though made with positive intentions, held great hubris and power. Tiamat copied his designs in fury at what she saw as his attempt to rule over the material plane. The dragons of the era fought each other based on principle. Through seemingly innate hatred for the others, chromatic and metallic dragons nearly killed each other to extinction through the ages. Seldom did a dragon live more than 300 years, with the exception of Yulong, the first ancient Wyrm. The almost mass extinction of different types of dragons allowed many of the smaller folk to thrive on the material plane after the Holy War.