Unarmed Sword Sage
From D&D Wiki
Class: Sword Sage
Level: 1st and 2nd
Replaces: Martial Weapon Proficiency, Light Armor Proficiency, WIS to AC
Some sword sages have forsaken their name, and have studied with monks to perfect their most deadly weapon: themselves. Gain Improved Unarmed Strike and the unarmed strike progression of a monk. You also gain your wisdom modifier to AC at first level, but only when unarmored and unencumbered.
Special: If you take any monk levels or have taken any monk levels, they stack with the sword sage's to determine unarmed damage.