You begin carrying a notebook or voice recorder with you in your adventures, storing conversations and research as you obtain it. For every successful use of the Research Weakness ability (see Researching Creatures) or the Exploit Weakness feature, you gain one Knowledge Point (a max of 10 can be stored at one time).
Each use of this feature expends 5 Knowledge points, once used these knowledge points cannot be used again until after a long rest. As an action or by spending one action point you may rifle through your notes and discover something about your subject.