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Most beholders are isolationists who hide in deep caves.
Xanathar, however, is quite a special kind of beholder. He likes to go on adventures and collect treasures and samples of the creatures he meets. Over the years he has writte many scrolls about his finds. This guides is a collection of those scrolls. (Even if he's to make you believe he can memorize everything... after all beholders have a big brain.)
Click on the picture to get your own copy of the Xanathar's Guide to Everything: