Your ki energy is attuned to a chosen element, which you can use to empower your attacks.

<php>echo “<b>Prerequisites:</b>”;</php> Wis 13, Improved Unarmed Strike, Ki, BAB +2
<php>echo “<b>Benefit:</b>”;</php> Upon gaining this feat, choose one of the following energy types: acid, cold, electricity, or fire. As a swift action, you can spend one ki point to surround your fists and feet in elemental energy. For the rest of your turn, your unarmed strikes deal an additional 1d6 damage of the chosen energy type.
<php>echo “<b>Special:</b>”;</php> You can gain this feat multiple times. Each time you take the feat, you must choose a new energy type.