Diablo 4's Season 15, 'Season of Hell's Legacy,' was delayed on September 15 due to server issues, with Blizzard confirming the season launched 'now' after resolving the problems. Players reported login errors (codes 3000008 and 3000006), and some experienced progress resets, though the delay was described as brief. Solo Self Found mode remains temporarily disabled.
The season celebrates Diablo's 30th anniversary with nostalgic elements, including Waking Nightmares quests that recreate iconic boss fights from the series, such as Diablo, Baal, and Mephisto. It also introduces nine permanent Legacy Uniques, including items like the Stone of Jordan, and features Deckard Cain's debut in Diablo 4.
Despite the launch issues, some players discovered hidden content, including a secret Diablo 2 Easter egg. A streamer found that combining specific runes and a low-quality chestpiece in the crafting system produced the Stealth chestpiece, a Unique item from Diablo 2. This suggests Blizzard included Rune word recipes from the older game without official announcement.