Enchanting a book can give you Piercing and Protection in one book

Enchanting a book can give you Piercing and Protection in one book, which you can not use then.

 

Step 1: Is to get a book and select the highest level in the enchantment table.
Step 2: Is to wait, if you see Protection 3, that was on my case see if you get Piercing 4 on the same book aswell.