Volo's is a must have for DMs looking to expand their game. Not only does it add fun races for players to be, but it has a whole section on lore to expand the game in ways to make it feel more developed. It also has a great extension to the bestiary which enhances combat options. I love Volo's.

A great resource to research baddie beasties for our Dungeons & Dragons adventure sessions!  :)  My husband refers to it often, and I and our friends get to enjoy the results. :)