In looking over the class descriptions, it seems that the phrase "luck check" is used in what I would consider an unintuitive way:
A thief gains additional bonuses when making a Luck check, as follows. First, the thief rolls a luck die when he expends Luck
A halfling gains additional bonuses when making a Luck check, as follows. First, a halfling doubles the bonus of a Luck check. For every 1 point of Luck expended, a halfling gains a +2 to his roll, rather than +1.
Is luck check really what is meant here? Shouldn't it be "when burning luck"?