Boundless Reserves 2014

You have learned to harness your inner vitality to replenish your ki. You gain the following benefits:

Increase your Wisdom score by 1, to a maximum of 20.
When you start your turn and have no ki points remaining, you can use a reaction to spend one Hit Die. Roll the die and add your Constitution modifier to it. You regain expended ki points equal to up to half the total (minimum of 1). You can never have more ki points than the maximum for your level. Hit Dice spent using this feat can't be used to regain hit points during a short rest. You regain spent Hit Dice as normal.

Source: Tome of Heroes (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details