During the latest Campfire Chat, Blizzard Entertainment unveiled the specifics of Diablo IV Season 5, which is slated to begin on August 6. It will be a shorter season than usual, running for only two months before the release of the Vessel of Hatred expansion (due on October 8).
However, its content and feature set are rather interesting. To start with, the developers are adding a brand new roguelike mode called Infernal Hordes. Players will have to go through a new questline first, taking place after the main campaign; this questline will stay on the Eternal Realms even after the end of Season 5. The story begins in Hawezar, where the heroes will have to investigate a disturbance among the townsfolk. After finishing the questline, you'll unlock the Infernal Hordes mode for all characters on your Diablo IV account.
Heroes will have to head back to Hell to face time-limited (90-second) waves of hellspawn. They'll collect Burning Aether during a wave to spend at the end of a successful Infernal run. At the end of the 90 seconds, kill the remaining enemies and choose from three Infernal Offers. These give you a choice of three different Boons & Banes that modify your run, such as Elite damage increased, but Elites grant increased Burning Aether. Infernal Offers will stack across the duration of your Infernal Hordes run and any can be active at the same time. They are your chance to increase the difficulty in order to earn more Burning Aether or select a more modest Infernal Offer if the intensity is too great.
Once chosen the Infernal Offer, the next wave will begin. Successfully kill all waves in the tier you are attempting to advance to, then battle the Fell Council. Originally created to protect from the Prime Evil Mephisto during the events of Diablo II, these noble priests were corrupted and became champions of the very demon they were sworn to
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