From the introduction: A conversion for the classic S3: Expedition to the Barrier Peaks This complete conversion balances the adventure for four player characters of 8th level which is similar to the originals “An adventure for characters levels 8-12”. NPCs, numbers of creatures, and other encounter details have been modified where necessary to accommodate the appropriate degree of challenge. User summary: Use of this item requires a copy of S3: Expedition to the Barrier Peaks.