From Diablo Wiki
Seasonal Legendary items can only be found by seasonal characters during each ladder season. After each season ends, these items become findable by all types of characters, and a new crop of seasonal legendaries are implemented for the next season.
These are not necessarily the best legendary items, as the goal of the developers is not to create a whole new tier of top power legendary items; just to add some new gear and variety.
Pages in category "Seasonal Legendaries"
This category contains only the following page.