From publisher blurb:
Extraordinary Races
Go beyond the standard fantasy races and play a new breed of hero. These intrepid adventurers forge their place in legends with splinter, gill, electron, and scale. Now you can play one of these heroic races in your home game and battle monsters like never before.
Book of Heroic Races: Player Races 2 introduces a number of playable races for your fifth edition game. This 13-page supplement gives you everything you need to include the following races at your table:
Androids, machines with human-like souls, including subraces powered by alchemy and technology
Geppettoians, a halfling-sized, wooden construct race possessing free will to forge their own paths
Gillfolk, a race mutated by powerful sea monsters to serve as slaves who have won their freedom, featuring two subraces defined by where they live in the sea: the shore-line gillfolk and their deep-sea cousins
Lizardfolk, scaly swamp-dwelling heroes whose subraces originate from draconic progenitors or stewards of nature