Diablo 4's Season 15 introduces classic Runewords from Diablo 2, created by combining Runes with normal quality base items in the Horadric Cube. Thirteen Runes and seventeen Runewords are now available, with many offering multiple variations depending on the base item used.
Blizzard delayed Diablo 4's Season 15 launch on September 15, 2026, after players encountered widespread login errors (codes 3000008 and 3000006) and other technical issues. The season, centered on the franchise's 30th anniversary celebration and featuring new story quests with Deckard Cain and legacy unique items, will be rolled back pending resolution.