1. Jack of All Trades
Jack of all trades allows a player to retest an ability that they do not possess at all (not just one they are currently out of) once per challenge. In order to retest in this way they must expend a temporary mental in order to initiate the retest. That trait is lost regardless of the outcome of the challenge. The only exception is lore challenges which can only be tested once per story. See definition of story for more details.
Jack of all trades allows a player to retest an ability that they do not possess at all (not just one they are currently out of) once per challenge. In order to retest in this way they must expend a temporary mental in order to initiate the retest. That trait is lost regardless of the outcome of the challenge. The only exception is lore challenges which can only be tested once per story. See definition of story for more details.