Hi there! About the notetag for excluding an enemy from the bestiary, this is a good idea! I'm going to put this in a plugin update. About the way of adding a description, can you show me how have you configured the whole thing? :)
Yea I've put
<BeastProfile: Hello World!\nNew Line!>
In the enemies' note tags
and I've put into the Info Window Lines As such
Line name
Profile
Value
text = !!enemy.meta["BeastProfile"] ? enemy.meta["BeastProfile"].trim() : ""