The reward book is a gift from Xuan once you have completed the Jack of trades aura's regular skilling. Once the aura depletes on its own or the owner removes the aura after he has trained in 10 different skills, they may get the book, but will not be able to receive another book until they use the first one.
The formula for the experience gained is .
template = Template:Jack of trades calc
form = jotf
result = jotr
param = type|Jack of trade|Normal|select|Normal,Master,Supreme,Legendary
param = level|Skill Level|1|int|1-120