Looks like a Sub Skill for Unarmed Combat is Bell Ringer, allows for spending Stamina to deliver a Punch to the head of a person to Stun a person for up to 3 Seconds.
There may very well be other Types of Cultivation available then just God/Clergy Faith Cultivation, say Physical or Stamina/Chi, or a Mana or a Mental Cultivation methods?
There could be a physical mana cultivation. It could be similar to the way Ricther empowers a golem. Instead of imbuing a golem with mana it could be based on some fractional system. Where they mana drain and absorb mana from something. It would be to powerful and offer to fast a growth to be a one for one. Or it could be like stretching your Chi. Where your mana reservoir has to be stretched to hold more mana.