If you would like to unlock Monk bestiary I recommend to choose:
Dark Cathedral floor- 2 along with bestiary for Witch (15), Ghost (15), Dark Apprentice (15), Dark Monk (15), Assassain (15) and many more.
More details about Dark Cathedral:
https://www.tibiaqa.com/400/whats-so-good-about-dark-cathedral
I recommend:
Youtube video
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