No DM Adventure: Fortress Of Forbidden Magic (Patreon)

https://www.kassoon.com/dnd/no-dm/fortress-of-forbidden-magic/ 

When children begin to disappear near an isolated fortress, you must  brave untold supernatural dangers to confront the noble-turned-warlock and break his demonic pact.

https://www.kassoon.com/dnd/no-dm/fortress-of-forbidden-magic/