Diablo 4 developers recently teased a new seasonal mechanic being introduced with Season 6. Season 6 is set to launch alongside the Vessel of Hatred expansion on October 8. Diablo 4 just recently launched Season 5 on August 6, with the addition of the Infernal Hordes activity, where players fight waves of strong enemies to earn Burning Aethers, which they can use to earn unique items for their class.