From publisher blurb:
Add depth to your Hero or Foes with Races and Professions!
If you've ever wanted more options for your PACS Heroes or Foes, this expansion is for you! Included are 18 cards that allow you to modify any Hero or Foe for additional flavor and power. Now when you say your Ranger is an Elf, you'll gain some Elven bonuses to your character. Dungeon Masters can use the cards to modify Foes similarly.
Please note that this is an expansion for PACS (Pocket Adventures Card System). You will need a base set of PACS to play the game.