Epiphenomenalism, Artifactuality, Morality, Will to Power

Artifactuality defies Epiphenomenalism, which conceives all phenomena if not as illusory, at least as signs of some noumenal processes.  For, the meaning and value of, for example, a chess match is exhaustively defined by the invented rules of the game, independently of any covert, e. g. Psychological or Metaphysical, interaction involving the players.  Likewise, the meaning and value of the artifactual practice of Promising is exhaustively determined by its stipulated definition.  Thus, Nietzsche's esteem for Promising suggests a complete disavowal of the neo-Schopenhauerian interpretation of Morality as Epiphenomenal, which he espouses as late as The Gay Science, e. g. #1.  Accordingly, a Morality derived from the Will to Power, a doctrine which he invents, is a radical departure from all previous doctrines, to whatever extent they are conceived, ontologically or naturally, as given as 'true'.