AddCreeperWithCap(<-cellX <-cellZ <-creeperAmt <-cap)
Adds creeper at the specified integer map coordinates. A value of 0 means no creeper. A negative value indicates anticreeper. The cap is the clipping value for the result. After the creeper is added to the destination location, if it exceeds the cap then the value will be clipped to the cap. The cap should be a positive number. For the case of adding AC (a negative creeperAmt), the cap will automatically be negated internally. If you specify a negative number for cap, it will be internally converted to a positive number before use.
AddCreeperWithCap(42 23 1000 1500)