The Red Mausoleum

From the publisher's website:

"The populated regions north of the Sistermoors have enjoyed over a century of respite from the wars that once plagued the area. However, within the past year, baronial patrols have reported clashes with undead and other dark creatures brave enough to strike out from the moors into the forests of men and elves. The Baron’s sage suspects that the undead issue out of the mysterious ancient landmark known as the Red Mausoleum located somewhere on the wild stretches of the moors! The Red Mausoleum is designed for 6-8 characters of levels 12-15 and is compatible with 1st Edition gaming."