The greatest Dungeons & Dragons campaign setting ever made. It was created by a man named Keith Baker (who submitted it as an entry for a
worldbuilding contest hosted by Wizards of the Coast), and is known for for introducing the
Changeling,
Warforged, Kalashtar, Shifter races as well as the Artificer class and dragonmarks. More importantly though, Goblins aren't mindless xp farms and Halflings ride VELOCIRAPTORS!!!!!!
Sasha: "Hey what're we going to do for our next
Dungeons & Dragons Campaign?"
Ardy: "We're playing
5e Eberron! The /GREATEST/ Campaign setting ever made by the holy lord Keith Baker!"
Sasha: "... Again?"