During the cataclysmic God Wars, the elves were constantly threatened by the wars beyond Arandar. To prevent the discovery of Prifddinas, the elven capital, they had to ensure that the mountain range that separated Tirannwn from Kandarin was not crossed. When invading forces crossed the mountains, the elven clans would eliminate them.
Soon the Cadarn Clan proved the strongest of the eight families, eventually almost completely controlling the elven military. As a result, the Cadarn Clan was extremely important, often standing as the sole line of defence against the wars beyond.
When the God Wars ended, many elves travelled through the Underground Pass into Kandarin, where they began to establish settlements and treaties under the rule of King Baxtorian. Nearly all of the Cadarn Clan left Tirannwn, taking up protection over the elven settlers.
However, this left Prifddinas open to attack, not from foreigners, but from the Iorwerth Clan, one of the eight Elven Families. Led by Lord Iorwerth, the Iorwerth Clan was able to easily take the city, allowing them to control the Tower of Voices. The other seven families were forced to leave Prifddinas.
When conflicts in Kandarin forced the Cadarn Clan to return to Tirannwn, they were unable to defeat the Iorwerth Clan. They now live with the other six clans, exiled in Isafdar, where they continue to fight to reclaim Prifddinas.
The only known member of the clan that is alive today is Islwyn Cadarn.
- The word "cadarn" in Welsh means "tough", "strong" or "powerful".
- Cadarn is pronounced ka-darn.