With thanks to wikipedia: Ostrander also added several new concepts into the Spectre's history: He revealed that the Spectre was meant to exist as the embodiment of the Wrath of God, and Jim Corrigan was but the latest human spirit assigned to guide him while he existed on Earth. It was also shown that the Spectre was a fallen angel named Aztar who had participated in Lucifer's rebellion, but then repented, and that serving as the embodiment of God's anger was its penance.
MY FAVORITE PICTURE OF THE SPECTRE is the one NEAL ADAMS DREW FOR ME ON MY BIRTHDAY! It has his head looking down at his hand which holds DEADMAN who asks the SPECTRE do you know what day it is? the SPECTRE replies: Yes, it's NICK PASCALE's BIRTHDAY! I still have it in storage!