Ki-Empowered Strikes is a Monk passive feature that allows unarmed attacks to count as magical while attacking enemies with resistance to physical attacks. In effect, unarmed attacks will ignore resistance and immunity to 
Slashing, 
Piercing, 
Bludgeoning non magical damage of the corresponding type.
Description
Your unarmed attacks count as magical for the purpose of overcoming enemies' Resistance and Immunity to non-magical damage.