With the new cap of 150, I noticed that it’s now possible to reach Shadowy 175 and obtain the Intriguer’s Compendium from the relicker IF you have the Pony from last year Christmas. Through normal play (without spending fate) the max extra Shadowy from items we can get right now is +23. So the Pony perfectly gives the last 2 Shadowy you need. For players without the Pony (like me), it seems we’re out of luck right now. The closest we can get it seems is +24 Shadowy by playing the Foreign Office Fate portion and getting the shadowy boosting companion. Now, I don’t know if among the Feast’s gifts there are those that can boost the max Shadowy further, it may change things if there are.
Well, this is my observation. Please correct me if I made a mistake(s).