The Royal Mausoleum

From publisher blurb: An adventure shard for a party of level 7 to 9 heroes who oppose the undead. The Royal Mausoleum is designed to prevent the creation of Undead, and prevent their access. But beyond that, its power over souls means that the undead cannot even touch its shores. All of this - and yet it still hides a fragment of the Deathless One's soul. The Extended Challenge rules-set is included alongside the Adventure Shard allowing you to make use of a new subsystem for deeper non-combat challenges.