Carcosa, the imprint founded by Karl Edward Wagner with partners David Drake and Jim Groce, came to be partially out of the concern that Arkham House would close shop after the death of August Derleth in 1971. Thankfully, that didn’t happen. But for me, the four Carcosa volumes are Arkham House books by extension. They are design-executed as traditional AH titles and are absolutely essential books in the macabre-fantasy genres.