Hi! I am currently GMing this game and can hopfully help you. On p. 8, right beneath the header of Role and vows, it states "Each role comes with three Vows to earn Hope." My group and I take this as, fulfilling a Vow at any point will grant you a point of Hope. On the topic of enhancing magic, see p. 19, the paragraph right before Traversal rules gives a number examples on how enhancing might work, to paraphrase: increasing the length, volume or number of targets.