Code strings The following was datamined in early 2013, when Reaper of Souls datamined information lists some information about how to enable was still in early production and Nephalem Rifts were still called "Loot Runs and the content that will be found on them. " The information is from an early version of the game and will likely feature changed greatly before release, but it's interesting to see modifications by how the final productearly planning was taking shape.[http://diablo.incgamers.com/blog/comments/diablo-3-reaper-of-souls-info-leak-datamined] From the information in the RoS datamining, Loot Runs are an [[end game]] feature, enabled only after a player finishes Act 5 on Inferno difficulty. (Or possibly enabled for any difficulty once Act 5 is beaten on that difficulty.) There are multiple (at least 10) different Loot Run dungeons, all of which are randomized each time. Players earn the right to enter them by finding Loot Run Keys and taking them to [[Zoltan Kulle]], who returns as an NPC in Reaper of Souls.  Zoltan Kulle opens the portals -- only one at a time may be active -- and players pass through them to conduct Loot Runs.

Loot Runs sound much like the [[Infernal Machine]] portals, in that only one can be active at at time and another one can not be opened until the previous one has been defeated.