Frenzied and sinister ravings of an imagination gone berserk
The precepts of this school hold to a thematic vocabulary drunk with nightmare images wherein nature becomes the eerie, fantasy-ridden background against which the human and animal worlds mix and intertwine like so many poisonous growths or evil mutations shedding the frenzied and sinister ravings of an imagination gone berserk. John Gruen
It's the thematic vocabulary which is drunk with nightmre images, not the precepts of the school.-- Yes.
I don't understand the meaning of "shedding" above; 'shedding' usually means to discard, to disperse, etc.-- Probably 'emitting' is a near synonym here.