Nightmares at Thorn House

From publisher blurb: Mini-Dungeon for 3–5 characters of levels 6–8 When the renowned mage Khalastan, went missing in search of forbidden knowledge within the ruined tower of Z’lar Kotek, tremors and magic surges have wracked the surrounding landscape. His desperate apprentice, Cal Renther, has asked for assistance in entering the ruins and save his mentor, but what awaits the adventurers that respond to his call is no mere little dungeon exploration! The otherworldly magics unleashed by Khalastan demand a price, and in order to emerge victorious, every hero must ask themself: Am I willing to pay the Toll of the Void?