This post is some raw ideas transcribed from some very loose notes from a one-shot adventure I put together for Swords & Wizardry. I present them here as a loose framework for anyone to use however they wish in their own games.
The immediate area surrounding the town of Silverbrooke has long been protected by the “witch” of the Citrine Tower. Though human, she’s been around as long as a lot of elves can remember. Her tower pulses with a fresh, yellowish glow that casts a serene light by nightfall (and is even noticeable by day.) She only leaves her estate two days a month to acquire goods from the local markets. It’s unknown where her wealth comes from — many speculate she’s a master alchemist, but her coins always have the imperial stamps of the time.
In the past year, however, her absence has been felt across the whole of the countryside. The fresh yellow of her Citrine tower is now a shade akin to a gingivitis grin. The crops around Silverbrooke have been suffering from a blight, and vines of thorns tendril out of the woods as if to suffocate the farmlands.