Patch 2.1 was a major content patch for Reaper of Souls. It was developed during the spring and summer of 2014[1] and went live to the PTR for player testing in late June, 2014[2]. After numerous patches and changes and added content/features, Patch 2.1 finally went live on August 26, 2014.
New features added in Patch 2.1 include: Greater Rifts, Legendary Gems, the artisan Urshi, the Realm of Trials, The Cesspools tileset, Greed's Domain, Seasons, Seasonal Legendaries, and hundreds of changes to legendary items and class skills.
This article houses not just the patch notes, but extensive collections of changes made during the lengthy PTR period, tracking the evolution of various new game features.
- See more at:
http://www.diablowiki.net/Patch_2.1#sthash.nmHN9miA.dpuf