During a recent game, I had a monk character use the Kiho "Stain Upon the Soul", which makes the target act as though they have a number of wound ranks filled as the attacker's Air. The opponent, while for all intents and purposes has human anatomy, only has a few wound ranks: +0, +5, +10, Dead. So if the character in question had an Air of 4, what would happen exactly? Thankfully, the character in question had a lower value so I just used the RAW and went forward but it truly made me think about situations with unconventional wound rankings. As a side note, I've been thumbing through my books and so far this is the only ability that I've seen that actually uses wound ranks instead of just the penalties of either side so I haven't seen anything comparable yet that includes a specified ruling.
For example, there's nothing I can see in Kiho, even for Atemi that says it must be a living or even human target. So what would happen to a zombie/skeleton with two wound ranks (healthy, dead)? For that matter, can Stain (or abilities like it) actually kill a being since the wound penalties beyond out are to be a dead creature? If they die, do they come back to life once the duration ends?