Most banking , security , communications , transportation and fabrication are run by the dragonmarked houses which use their exclusive access to the powers of dragonmarks to sustain their economic empires that extend far beyond rather mundane powers of the dragonmarks themselves .
Most banking , security , communications , transportation and fabrication are run by the Dragonmarked Houses . 
 The Houses use their exclusive access to the powers of dragonmarks to sustain their economic empires that extend far beyond arcane powers of the dragonmarks themselves .