Fandral's Frivolous Pamphlets

I wrote a book about that once.
After a long rest roll a d10.
Gain proficiency (or expertise if already proficient) in skill until next long rest.
1/ Arcana; 2/ History; 3/ Investigation;
4/ Nature; 5/ Religion; 6/ Medicine;
7/ Animal Handling; 8/ All Vehicles;
9/ Performance (choose type);
10/ Tool Proficiency of your choice.