[Kromm]

"Unarmed" means you have to use unarmed combat skills. Boxing, Brawling, Judo, Karate, Sumo Wrestling, and Wrestling all qualify (and so does basic DX, if you're silly enough to take that Vow without knowing how to fight). So do skills that work as attacks without weapons, like Kiai and Push. And yes, you're allowed to enhance your strikes with cat-folk claws, heavy gauntlets, Unarmed Master, etc. – anything that requires only the unarmed skills above. But this is a -15-point Vow for good reason: You cannot use weapons that require weapon skills, which means no ranged weapons.

Masha Deathfoot (Delvers to Go!, p. 8) illustrates this Vow. She uses Judo and Karate only. She specifically bought metal armor for her hands and feet in order to hurt people more. And she also specifically traded off her ranged weapon skill because of her Vow.