At a concept level they existed, but the artwork was new. I mean, everyone at Blizzard knows what an "Orc Warrior" should look like. Green skin, muscles, some

At a concept level they existed, but the artwork was new. I mean, everyone at Blizzard knows what an "Orc Warrior" should look like. Green skin, muscles, some type of weapon. But someone had to actually create new drawings of it for the game. This means that the main challenge behind coming up with a new franchise is to come up with a consistent, compelling concept for its various elements.