I think they should be in a module. Something like a "Moment of Truth" that a player gets once every session. The once per session thing may seem wonky, but it gives players a cool ability to use every time they sit down to play. Let them use it to auto succeed on a task (but only if they could potentially have succeeded in the first place), to stabilize and return to 1hp/ take a single action before falling unconscious, or to make a single statement about the world, such as "My character finds a scrap of the dukes cloak at the crime scene" or "I distinctly remember there being a scholar who studies magical beasts like the one we are hunting in that city we just left". This third one can be ignored for DM's/Players who don't like that sort of improving while retaining the usefullness of the regular mechanic. It's something I've toyed with in the past and seemed fun.