A quintessentially Numenera five part dungeon for DnD 5e. Arcana of the Ancients is a must have to run this adventure for monsters and treasures (handy page numbers are included in the margins). The location of the "Grave of the Machines" is deliberately vague so as to easily fit into your existing game world, and there are optional links to "The Hills of Crooked Sleep" adventure found in Ancana of the Ancients.

I'd say this is a must buy for DMs who already own AotA, and I'd recomend players stay away so as to not spoil it for themselves. Cypher system GMs can use this book with the help of an apendix in the back, but it'll add a lot of page turning to your prepwork.