One might wonder why Jin had not used the forest itself to power the Banishment Ritual. Cultivators from the ancient times did not have any shame in using the chi around them to power their techniques up after all.
Even Grandma Yuan who had executed her Gleaming Thunder of the Golden Griffin utilised the ambient chi particles around her to do so. Of course, she also abused the System's ring for the majority of the actual execution but taking from the surroundings was equally important. The amount of chi she and her Golden Griffin exuded was excessive, and it did not hurt to take some back as part of a 'recycle' process.
