With the patch 2.7.3 PTR lasting until March 24, our original guess of Sunday, March 27 was of course no longer possible. It’s fair to think of the Echo of Nightmares as an extension of the Nephalem Rift system - just as Greater Rifts require you to run normal Nephalem Rifts to gain the means to open them, the Echoing Nightmare requires Season players to gather Petrified Screams from Greater Rifts to unlock them as well. Season 26 introduces the Echoing Nightmare, a special endgame activity that will only be available for Season players and, at least as far as we know, will only last until the end of Season 26. With Season 25 ending on April 10, we now know that the Season will last 17 weeks, tying it with Season 4 for fourth longest Season. Before that, Season 23 was 15 weeks, and Seasons 22 and 21 were both 18 weeks.

Diablo 3 Season 24 lasted for 19 weeks, making it one of the longest Seasons since Seasons were implemented back in 2014. Season lengths can be pretty variable - the shortest was just under three months and the longest was over five months - but most recent seasons have hovered around four months.

Diablo 3 Season 25 started on December 10, and we now know it will end on Sunday, April 10.

Diablo 3 season 13 start and end date