There are Rotgrafen who are so domineering that they cannot rely on the members of their crew to complete crucial tasks under stressful circumstances. Developing this power in order to satisfy their urge to control all aspects of a ship’s function, they learn to transmit their will through the very hull of the vessel, allowing them to seize command of any mortal who touches it.
Worse yet, this power allows Rotgrafen to defend most insidiously against an attempt to board, subjugating the attacker the moment he touches the hull of the vampire’s ship.