That was the worst nerf I have ever seen in my entire life. It's as useless as my early morning dump.
It takes way too much XP and it should be lowered atleast to 30-50 because seriously, what's the point of studying it if it takes so much XP.
Even early world it will be useless because people will be too afraid of wasting all the XP.
It consumes less xp per hour now then it did before. I like the spot the mirkwood is in right now. You only need 12 to study them for an entire day, they still offer decent LP/hour and you don't have to spend 3 hours making them to study them for one day.