Season 15 has added a ton of new content, discoveries, hidden secrets, and references to older Diablo games. The season has been widely praised, with many players asking for the new content to become part of the base game going forward, and this is reflected in the player numbers, as it has far surpassed every previous standalone season on Steam.
If you need a refresher, here is a list of every new content, secret, and Diablo reference Season 15 has added:
Seasonal Mechanics
Splinters and Runewords have added extra layers of character customization, providing new powers and highly sought-after items.
Secrets & Discoveries
The community has been hard at work discovering new secrets, hidden questlines, and even a Horadric Council boss fight.
- Old Tristram from Diablo
- Pandemonium Event, Uber Prime Evils, and the Hellfire Torch from Diablo 2
- Whimsyshire from Diablo 3
- Mefishto, the Lord of Relaxation
- The Secret Sheep Level and the Map of the Stars
- The Lucky Ring Questline and the Echoes of the Horadrim
Secret Cow Level
The Secret Cow Level discoveries continue in Season 15 with a new World Boss and Bovine Cosmetics.
New Capstone Dungeons
The Prime Evils have returned to Sanctuary in their respective Capstone dungeons, offering an abundance of loot and nostalgia.
- Echo of Diablo in The Labyrinth
- Echo of Baal in the Worldstone Keep
- Echo of Mephisto in the Durance of Hate
Waking Nightmares
Waking Nightmares are new dungeons inspired by old Diablo games that either exist in the open world or can appear as a pop-rift during activities such as Helltide.
- Diablo
- Halls of the Blind
- Unholy Altar
- Chamber of Bone
- Cathedral: Level 4
- Diablo Hellfire
- Lester’s Farm
- Tristram Outskirts
- Cornerstone of the World
- Na-Krul’s Crypt
- Diablo 2
- Den of Evil
- Forgotten Tower
- Tal Rasha’s Tomb
- Crystalline Passage
- Flayer Jungle
- Nihlathak’s Temple
- The Cairn Stones
- Diablo 3
- The Scouring of Caldeum
- Cellar of the Damned
- Pandemonium Fortress
- Caverns of Araneae
- Iron Wolf Outpost
- Diablo Immortal
- Horadric Library
- The Realm of Damnation
- Windswept Shoals
What Should Stay After Season 15?
Many players have enjoyed reliving key moments from the Diablo franchise in Season 15. Whether it’s exploring the Cathedral beneath Tristram and encountering Diablo, fighting Mephisto in the Durance of Hate, or destroying Baal at the Worldstone Keep, the new Capstone dungeons have brought back that iconic Diablo flavor to the series along with some very nostalgic music.
Runeword Crafting has also provided an interesting new layer to item customization. From crafting an early Stealth for leveling to zooming around in the endgame with an Enigma, the new options provide more depth to building your character.
And lastly, one of the biggest highlights of the season: all the new secrets and discoveries made by the community. From the continuation of the Secret Cow Level, the discovery of the Secret Sheep Level, and the Lucky Coins questlines, the community has been hard at work solving riddles and meticulously testing interactions to discover all the secrets hidden in the game.
With the announcement of Diablo 5 and that Diablo 4 will not be getting any more expansions going forward, the question on everyone’s mind is how will seasons look like from now on, and what should stay in the game from the massively successful Season 15. This season has proved that seasonal content can rival even expansion releases, when done right.
