Hi champs,
let’s take a minute and think about the possibility to have personal dungeons/ a dungeon editor.
On story side we could first find and clear a dungeon in the open world map and after that we flag it as our ,personal’’ dungeon.
On the next step we have to collect some demons/monsters/animals/enemies for it to populate it. Why should we do something like that?
- maybe because we are a lil bit strange and love to collect monsters?
- maybe because we want to train and improve our skills against these monsters?
- maybe we are a leader of a guild and now, our guild members can do a training in our dungeon to master their experience?
- or maybe just for the fame, collect the hardest monsters (including world bosses) and let other player try to clear your/my dungeon.
There are other reasons too, and because that i think it would be a cool option to have it.
A full dungeon editor would be very good too. So we as user could design a lot of different dungeons… less work for your workers (Blizzard)… and u don’t have to pay anything for it.
Maybe u remember the map editor from the Age of Empires games. With it, the community could create very cool different maps (in d iv dungeons). Would be a very nice option for d iv too.
Think big! 
salam.