Question: Who published a supplemental sourcebook to the core rules of the second edition of the "Advanced Dungeons & Dragons" designed by an American game designer at a company where he was employed for over fifteen years?
Sentence (from "Book of Artifacts"): The Book of Artifacts (abbreviated as BoA) is a supplemental sourcebook to the core rules of the second edition of the "Advanced Dungeons & Dragons" fantasy role-playing game.
Relevant evidence: Yes