From publisher blurb:
Whether you're into ShadowDark, or one of the dozens of new OSR / old-school "D&D" rule-sets that've come out over the last few years, this is a memorable and easy-to-run scenario for veterans and novice GMs alike.
If this new series, SHADOW-CHA'ALT, is well-received, it'll come out on a monthly release schedule. It's an opportunity to dial back the sleazy gonzo, making the campaign setting of Cha'alt more accessible for the average gamer whose group conforms to mainstream tastes.
Volume one of SHADOW-CHA'ALT is called Darkest Periwinkle Shadowhack: The Cha'altening. Instead of the desert, it begins in a typical pseudo-medieval village near a forest. Strange dreams foretell of a looming apocalypse as young, able-bodied villagers are expelled to a cave in the middle of the night, hoping to hear reassuring news from the blind seer.
This could be a one-shot or introduction to a new campaign. If you're interested in trying out something new but also familiar, this is the place to start.