Rowan understood that he had a powerful weapon, but this weapon would be useless if not aimed properly and not used effectively and efficiently then the great advantage he had would be lost. There was no certainty in life, but if he managed to screw up this opportunity he had with carelessness or an ill-advised plan, then he would not rest in peace even in death, with the weight of his stupidity choking his corpse.
Every time he used this power, he must never leave any traces behind, everyone who was aware of this power would have to die at the end of every journey, it did not matter if they were to be his children, Rowan could leave no traces behind because there was no one he could ever trust with this knowledge, of all his powers, Rowan believed that this one was among the riskiest he held.
