A dreg dragon is a dragon whose body begins to rot and fester upon birth. The dragon can survive in this condition due to the fact that their vital organs are kept isolated and healthy while their muscle tissue and scales fill with disease, a racing immune system keeping their flesh just alive enough to keep them strong. Dreg dragons are actually rather civil creatures when they speak to either other dreg dragons, or creatures that live nearby it's home. The dragon will still attack a familiar being if doing so suits it's purposes, but they will tend to be calm otherwise.