The Elements of Hand to Hand Combat

You are better at fighting unarmed.

You can also channel the elements through your body,
allowing you to deal elemental damage with unarmed attacks instead of physical damage.

Affinity:
When you take this class, choose which type of elemental damage your unarmed attacks can deal.
Whenever you decide to deal elemental damage instead of physical damage with an unarmed attack, it will normally be of that element.
You can try to use this ability using a different element, but must pass a DC 20 test of Spellcraft each time to change the element from what it normally is.

When you attack, you may Spellburn 1 to change the element of the damage your unarmed attacks deal for the rest of the encounter, without needing to pass a test of Spellcraft.

Suggested Backfire:
Overload: You deal the damage of one unarmed attack to yourself, and lose the ability to deal elemental damage with your unarmed attacks using this ability until you rest.

(Unarmed attacks can be heavy if you are using heavy Fistwraps of Fury.)