Another, less scrupulous way to obtain Tomes, this prevents Lost students from hogging valuable tome copies,
Add a new Subrule to the Rule entitled “Law of Loss” .  Call it “Filching Tomes” and give it the following text:

If a Lost Student has one or more Tomes, any non-Lost student may remove a Tome from the Lost student’s “Tomes” GNDT column and add it to eir own, along with a comment of “Filch NDICE20” where N is one plus the number of times he has performed a Filch this dynasty.  This action is known as a Filch.  The student who performed the Filch then loses Sanity equal to the result of the roll.