Guild Wars 2

i had this idea for some time now.
recently doing fractals and other dungeons gave me this idea.

an openworld dungeon. i had this feeling when i entered the crypts with the halloween event.

a dungeon you can challenge as a group or as a solo player.
a nice boss fight at the end + a decent reward.

a dungeon everyone can enter. or an instanced solo dungeon. (i think open world would be better so when you disconnect you just return there when you do a relog)

There are already open-world dungeons.

http://wiki.guildwars2.com/wiki/Mini-dungeon

There are several open-world mini-dungeons (most of them are explorer achievements). Many of them would be very tough to solo, though.

Deffo. I did the firehearth Rise one alone, boss included. Long, nasty, but doable. Obiouvsly, trash reward. No more interest to even go there.