Military action
The great Orc War, a war that happened between 2 large rival Orc tribes, each organized and run by a different Dragon. The Black Dragon clan and The Silver Dragon Clan were at war for around 200 years, during this time fortresses were established all over the world of Ashanor. However, the last 20 were the most important as it was the time when the Silver Dragon Clan with the help of an adventuring party finally got the upper hand on the Black Dragon Clan.
During these years the humans and elves had taken to the waters to attempt to avoid the wars. Great pirate clans and allegiances took form on the waters, and once the war was done and the cities and fortresses cleared, the pirate lords took to the land to create a new rule. The Dwarves, however retreated to their underground cities with the hope the dragons wouldn't move inward. Fortunately for them the war occupied much of their time and the orcs and dragons never felt the need to move into the dwarven lairs.
The Black Dragon clan run by the ancient dark wyrm Glismoda was a major force for evil in the world, but was thankfully opposed by the Silver Dragon Clan and their leader the dragon Rascondus.
At the end of the war Rascondus sacrificed himself in order to lock away Glismoda in the shadow plane where as far as anyone knows he resides to this day. Glismoda's absence as well as the death of Rascondus set the planet of Ashanor into a form of peace.