Dragonmarks are passed through bloodlines and when two members of different dragonmarked families reproduce it often results in aberrant dragonmarks. The aberrant marks do not manifest identically each time therefore it is possible for two individuals with completely different looking marks to produce the same magical effect using the mark. Indeed each aberrant dragonmark is completely unique to its bearer. Originally aberrant marked were seen as outcasts and outsiders. Often they were shunned by the houses and eked out a pitiful existence. Many members bearing these aberrant dragonmarks have since united in their differences and formed House Tarkanan, most notably present in Sharn.