Games Workshop previewed the lore for Harrowdeep, the next season of Warhammer Underworlds, which is coming to preorder soon.  

The next season of Warhammer Underworlds descends from the living mountain of Beastgrave (see "Third 'Warhammer Underworlds' Season") to a labyrinth beneath the seas of Ulgu. There, dark magic lurks in the caverns of Harrowdeep, which is an ancient structure located below the Shadowsea. The structure is part labyrinth and part pit, and it was recently rediscovered by the Daughters of Khaine.

Harrowdeep features some clues that it might be or have been inhabited by Aelves. There are skeletons encased in shadeglass as well as the Penumbral Falls, a waterfall of shadow magic. The horrors that dwell in this labyrinth will be showcased in the rules and cards of Warhammer Underworld's biggest box yet. This game is a standalone, containing all the boards, cards, tokens, and dice needed to start the next season. There are also two warbands in the box: Kruleboyz orruks and Stormcast Eternals.

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