Blizzard has released a video showing off the beautiful world of Sanctuary in Diablo 4.
Sanctuary is a unique form of art that flows between the two areas, such as the melting ice waterfalls between the snow-capped Crack Peaks and the marshy Havezar. The dungeons in these zones will follow the art theme of their zone, ie. the snowy goatmen of the Cracked Peaks. A new family of monsters called Nengari is a twisted amalgam of human and snake body parts.
