Diablo is celebrating 25 years of demon-slaying, and what better way to honor the occasion than to explore the dungeon where it all began in the return of Diablo III's Darkening of Tristram event?

The event sees players hunting down mysterious cultists in Diablo III's adventure mode before being able to dive deep beneath Tristram cathedral in order to battle iconic enemies from the franchise's past, including the Lord of Terror himself. Once inside the 16-floor dungeon, the game takes on a retro-inspired look and feel to mimic that of the original Diablo dungeon-diving experience, including a UI overhaul and limiting players to only moving in eight directions.

Along the way players can score some exclusive event rewards like unique transmogrification effects, exclusive achievements, special pets, and more. The Darkening of Tristram will be live in Diablo 3 until January 31, after which players will likely have to wait until the same time next year for another chance to experience the event.