[quote=@Caits]
SO before I go putting Exp into the guidebook, does everyone want that? For now, I'll just make a list of known monsters
[/quote]

My personal vote is No. 
XP and leveling up is rarely a problem if the GM's moderate it and make sure someone doesn't lose their mind and lvl their char out of control and for this kind of RP, which very well may have a few time skips involved, it would be a waste of time and effort (especially for the GMs) having to track/manage the exact xp gains for 20+ people.