Adept's Training Manual
From Guild Wars 2 Wiki
Adept's Training Manual is a trait manual that gives access to adept-tier traits, allowing up to 10 trait points in any single trait line. These are available for purchase at each profession's respective trainer, usually located in or near each race's home city.“
Double-click to use. This item will unlock the ability to spend up to 10 points in all trait lines, and will refund your currently spent trait points. This item can only be used once.
— In-game description