No DM Adventure: Ritual of the Lich Lord (Patreon)

https://www.kassoon.com/dnd/no-dm/ritual-of-the-lich-lord/ 

Follow the trail of undead, where a skeletal swamp soaked in death magic provides the perfect place for a lich's foul rituals.

https://www.kassoon.com/dnd/no-dm/ritual-of-the-lich-lord/