Incarnations of Immortality

Incarnations of Immortality is the name of an eight-book fantasy series by Piers Anthony. The first seven books each focus on one of seven supernatural "offices" (Death, Time, Fate, War, Nature, Evil and Good) in a fictional reality and history parallel to ours, with the exception that society has advanced both magic and modern technology. The series covers the adventures and struggles of a group of humans, called "Incarnations", who hold these supernatural positions for a certain time.
Bibliography

1 On a Pale Horse (1983)
2 Bearing an Hourglass (1984)
3 With a Tangled Skein (1985)
4 Wielding a Red Sword (1986)
5 Being a Green Mother (1987)
6 For Love of Evil (1988)
7 And Eternity (1990)
8 Under a Velvet Cloak (2007)

Themes
Incarnations uses its premise to ponder questions regarding the nature of...