This is the Rat Prophet for the two big situations: when they can gank you and when then cannot. This guide is intended for experienced players who want quick and easy item choices. If you're a new player and don't understand the complex interactions that take place within Dota, then feel free to use this guide, but don't expect to understand it.
MOST IMPORTANTLY, BE CREATIVE AND OPEN MINDED. Nature's Prophet breaks all the rules and if you waste the entire game abiding by the typical rules then you're surely going to lose. So, learn to innovate or enjoy second place.