There are also many completely pure NPCs who are motivated by their own kind of evil, independent of the demonic influences. When it comes to NPCs, several highly corrupted characters seem quite unaffected by it while others are actively fighting against their own corruption. It is perfectly possible for a pure PC to do evil deeds and for a corrupted one to do good deeds. It is important to realize that pure is not necessary the same as good and corrupted is not necessarily the same as evil.
