 They skip the thrall stage, as well as lieutenant stage and go to being full-blown Wamphyrii, though not quite lords/ladies in their own right quickly, sometimes in a matter of days.They add on mass rapidly, as well as fully developing powers much more quickly than other means of transformation.They are prone to rapid development though the precise speed is variable, ranging from days to a few months or years for full transformation and final form to settle in.