Something I loved about Neverwinter... it was probably the only thing I liked about that game to be honest, was the ability for players to create their own dungeons and share for others to play. They basically got a modding tool ingame, which lets you create characters, dungeons, specify loot and exp, set level requirements, create unique looking bosses. Yep basically everything you need to make a fun and comepletely new dungeon.
I hope zinemax will look if this is a feature that could fit into ESO ^^