The titles says it all. It gives house guests (For obvious reasons it doesn’t give Monstrology XP)
Any mobs that require 20 Monstrology, High Chance of getting
Any mobs that require 30 Monstrology, Mid Chance of getting
Any mobs that require 50 Monstrology, Low Chance of getting
Exclusive Mobs/Npc that can’t be gained by Monstrology; Grandmother raven, The bat, The Rat, The Scorpion, Ravenwood Teachers, Headmaster Ambros and so on, Very Low Chance of getting