Plague Garden by Josh Reynolds

As the War for the Realm of Life continues, Lord-Castellant Lorrus Grymn leads the battered remnants of the Steel Souls warrior chamber against the sargasso-citadels of the Verdant Bay. The Hallowed Knights claim victory, but at a terrible cost - Grymn is lost to Realm of Chaos. Now Gardus, newly-reforged and fresh from the destruction of the Scabrous Sprawl, must lead his warriors into the foetid heart of Nurgle's realm in search of the Lord-Castellant, where they must once more brave the horrors of the Realm of Decay...
Read it because
It's a return to the Mortal Realms. sort of. It's something new for the Age of Sigmar as the Stormcast Eternals take on Chaos not just in the usual places, but right in the very heart of the Dark Gods' own domain.

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