During Season 20 of Diablo 3, we revisited Season 14's theme of double goblin delight.
I'm going to irritate people with my love of Diablo seasons someday.
To all the Goblins I’ve chased before: The best, most interesting, and most exciting Seasonal Themes in Diablo 3
Diablo hasn't always had Seasonal Themes, but they make each Season something special.
UPDATE: The Season 18 PTR is now up and the new Season 18 buff has been revealed.