This is somewhat random, but for the past few episodes I've thought it would be cool if the party had magical tome (perhaps given to them by the Tower/Hazan) which would collect them monster information which they could then use if they ever encounter same or similar monsters.
The tome would of course require one of them to attune to it and the monster information would only appear in the book when a monster was slain while someone had the book attuned to them. The book would consume part of the monsters essence for instance after the encounter and the person wielding the book could then during combat or precombat use their action or bonus action to look at the information. Maybe as a bonus action you could see general info like hp range (or exact but hp range could be better. It could also become more accurate as they slay more of the similar monster?) ac and such and with a full action give a party member advantage against the creature by guiding towards a weakness.
Since the book would be Hazan's when the party eventually TPK's Hazan could just go pick it up and it could somehow end up in the new partys possession. (Maybe a nefarious deal)
The book could become somewhat of a progressing lore of what kind of encounters there have been in world of Court of Swords.
So what do you think?
Shameless tag of @AdamKoebel and @itmeJP