Blizzard hasn’t yet announced the date Season 26 will end, however, previous seasons have usually run between 17 and 18 weeks. After completing five bounties in any given Act players will receive twice the number of Horadric Caches, as they would normally.
The announcement that the Echoing Nightmare will be sticking for the long haul comes with the 10th anniversary of Diablo which Blizzard is also celebrating with a bonus event which will run until the end of Season 26. In order to gain access to Echoing Nightmare, players need to have obtained an Petrified Scream from an Greater Rift Guardian and transmute it in Kanai’s Cube to gain access to the Echoing Nightmare. The Echoing Nightmare was only available to seasonal characters and required players in a battle with the ever-increasing power of Nephalem warriors that have died for more and better rewards. “Creating challenging, new and exciting game experiences will always be top of the list for us D2R Items, and we’re excited to keep this experience alive for the next few years,” the blog post says.
