House Tarkanan

House Tarkanan is a criminal organization based in Sharn consisting mostly of bearers of aberrant dragonmarks. The House takes its name from Lord Halas Tarkanan who, along with the Lady of the Plague, raised up those with aberrant dragonmarks to challenge the dragonmarked houses during the War of the Mark.
Tarkanan nonetheless has a reputation for assassination, thievery and other unlawful deeds.

History:

Though House Tarkanan was only founded in the last decade, The War of the Mark played an important influence on House Tarkanan's formation and ideology. The war began almost 1500 years ago, when the established dragonmarked houses launched an inquisition to exterminate those who carried an aberrant mark. Those who had aberrant marks were not united were desperate for leaders. Several rose to the challenge including Halas Tarkanan, also known as the Earthshaker. Eventually Tarkanan took refuge in Dorasharn (modern day Sharn) with his army and consort, the Lady of the Plague.
Though Tarkanan and his army resisted, it was clear that the combined forces of the dragonmarked houses were far too overwhelming and the resistance would in the end be wiped out. Eventually Halas and the Lady of Plague unleashed a curse which brought catastrophic earthquakes and summoned hordes of vermin from the depths. The curse destroyed Dorasharn along with Halas and his forces, ending the resistance.