 A fourth major account of the nature of metaphysical evil takes it to be something more substantive than absence, privation, or unformed matter. Call this the Real Property Theory of Evil: evil is some sort of reality—a determinate feature of certain finite beings (see J. Russell 1977, 1981, and Frankfurter 2006). Some versions of this picture say that evil is ultimately dependent on the good. Other, more Manichaean versions take the two to be coeval and independent, locked in an eternal axiological struggle. Although the relevant “property” here is supposed to have more reality or substance than mere absence or privation, there is still a kind of unintelligibility to it. The evil side of reality, the dark force, or the malevolent will is a kind of black hole for the “natural light” of reason—positively real, but inaccessible to complete explanation.