A Dungeon Master's Addendum on Van Richten's Monster Hunter's Compendium Volume III

From the introduction: An Official Ravenloft Expansion ... Dungeon Masters who want to use the ideas introduced in Van Richten's Monster Hunter's Compendium Volume Three in their campaigns will fall into two categories: those who will use it in a brand-new setting (either those published by TSR or of their own creation), and those who will want to use it in the gameworld where their current campaign is taking place.