Season 17's Cosmetic Rewards will be reintroducing the rewards from Season 5, but also brings the all-new Galactic Wings for players who complete the Season Journey. 'We’re looking forward to seeing the strange and unusual things players put together at all Torment levels, so let your creativity run wild and see what combinations of Ancients you can combine to play your own way!' the Diablo 3 Dev Blog stated. To emphasize what Season 17 is all about, the developer announcement shared thoughts about the theme for the upcoming season.

However, with the Season 17 buff, players will notice that equipping as many of these Ancient Items as the can will yield better boosts thanks to the Legacy of Nightmares, and thus make limitless build possibilities viable even through the highest levels of Torment. So far, the meta has always revolved around powerful Set items, as more often than not, Set bonuses provide fantastic buffs and abilities that are necessary to take players deeper into the end-game. Season 17 is all about experimenting with new builds that revolve around Diablo 3's numerous game-changing legendary items. Specifically, as long as Legacy of Nightmares is the only active set bonus a player has, every Ancient Item equipped will provide players with an additive bonus of 750 percent increased damage dealt and four percent reduced damage taken. In case you're not familiar, the Legacy of Nightmares set bonus gives players buffs based on the number of Ancient Items they have equipped (including Ancient Set Items, Ancient Legendary Items, and Primal Ancient Items).

For the duration of the season, all players will benefit from the Legacy of Nightmares set bonus. The Season of Nightmares' theme revolves around an all-new buff to be introduced when the season launches.

Season 17's theme is the Season of Nightmares, featuring the Legacy of Nightmares buff for the duration of the season.

Diablo 3 season 17 release date