The World Below Beckons! An essential underworld reference book for advanced players and GMs, Underworld Races & Classes contains new races and subraces, expands upon the lore of fan-favorites like the drow, and brings back a sense of excitement and exploration to subterranean realms. Play new underworld races like blood-sucking humanoid bats and savage, bestial crocodile-men, marvel at exotic vistas of living crystal, lush mushroom jungles, and vast underground oceans, and discover a wealth of new alternate classes, class options, feats, and much more.