If you don't know what they are....google it.
The proposition here is that there should be 3-10 (whatever seems balanced) fairy rings on an SG. If you find it...it's a pretty good mushroom harvest. but if you chop a tree within a given vicinity of one a little fairy appears and gives you a status effect (reduced LP for duration or wyrd or whatever). If you chop another it'll work like alcohol and step you up the scale of reduced LP until you recieve 0. At such point, the next tree chopped would KO the character. If character wakes up and chops again....perhaps even death.
You can always go track down the fairy ring, get a good harvest of mushrooms and go back to chopping after getting your first admonishment. Harvesting of all mushrooms tied to the fairy ring will cause the fairies to exodus and seek a new home (randomly respawn elsewhere on the SG).
It could be even two or three per region instead. The size of influence a fairy ring has, the number of fairy rings, and the number of 'warning stages' before KO would probably require some tweaking to be balanced.
The point here would be as a deterrent to chopper macros. The KO being necessary to thwart griefer choppers who don't care about the LP