Recently, the developers of Diablo 4 introduced the 10th "Season of Infernal Chaos" with a new type of loot, "Armor of Chaos", balance tweaks, and changes to the loot drop system.
Soon, they decided to launch a large-scale promotional campaign with free access to Diablo 4. Usually, they offered to play through the Blizzard "Battle.net" client, but this time the promotion extends to the Steam version of the ARPG.
The promotion will run until October 2. A sale is also being held in parallel: the base game received a 55% discount, and the bundle with the Vessel of Hatred expansion — 50%.