The term Toosha Tav refers to both a rank and an individual - though both of which are complete enigmas in the world. Those who hold the title of "toosha tav" no longer possess names even if they may have had one in the past thus are typically referred to by their title if referred to at all.
Two instances of a toosha tav have been noted to occur around members of the Queen's adventuring party, though it is not confirmed whether or not they were, in fact, the same individual.