From the article:
"Vincke: The multiplayer is right at the core of the game痴 being and it has a huge impact on the singleplayer experience as well. It痴 the essence of pen and paper RPGs, right? You don稚 play them on your own."

Exactly! I never understand when people say rpg games should be a single player affair when it was always about coop. The very foundations of the rpg are based on cooperation.