This section introduces monk vows, which any user of ki can take to increase his ki pool.
A monk can discipline his body to hold more ki by upholding the strict tenets of a vow. By adhering to his vow’s tenets, the monk’s ki pool increases by the amount listed in the vow’s description. Every vow comes with a penalty or limitation to offset this increase in ki. A monk can take a vow at any level, but it does not add to his ki pool until he gains a ki pool as a class feature. The ability to take these vows replaces the still mind class feature, even if the monk abandons all his vows.
If a monk knowingly and willingly breaks his vow, his ki pool is reduced to 0 (as if he had spent all of his ki points) and he cannot replenish his pool or use abilities that require ki or a ki pool until he has redeemed himself. Redemption requires a recommitment to his vow accompanied by an atonement spell. After the redemption, the monk’s normal ki pool (without the bonus from the vow) returns. If he upholds the previously broken vow for a full month, his ki pool regains the additional points from taking the vow, and he can decide whether to continue with his vow or forgo his vow without penalty. Once a monk forgoes a vow in this fashion, she can never gain a ki point bonus from that vow.
A monk may have multiple vows. Their effects and increase to his ki pool stack. If a monk violates a vow, he suffers the loss of ki described above; redemption means the monk regains the extra ki from his unbroken vows, but the extra ki from the broken vow does not return until he finishes the month-long commitment (in effect, violating one vow does not have an effect on the other vows once the monk redeems himself).
Pathfinder Roleplaying Game Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.