Blizzard is handing Diablo 4 players one Resplendent Spark after a messy Season 15 launch, with a short in-game note that says sorry and thanks people for “standing with us.” Season of Hell’s Legacy was meant to open September 15, 2026 as the series’ 30th anniversary season. Login errors delayed it the same day. After it went live, Solo Self-Found stayed down and Tree of Whispers caches failed to pay out for a stretch. The Spark arrives through the new Horadric Post in town. One Spark is the rare Mythic-crafting material you usually get by salvaging a Mythic Unique or grinding season ranks. Blacksmith Mythic crafts still cost two. It does not fix the week players lost. It does put a scarce currency in every mailbox. Check the mail icon before you burn another Unique in the Cube.