The world of Dr. Fate is full of gods, demons, magic, and hardships of being married to someone who’s involved with such things.
The Immortal Dr. Fate is a reprint of three Dr. Fate comics and this collection was published in 1985.
Dr. Fate is the personality taken on when someone wears the helmet of the god of Order, Nabu. Nabu is an ancient force who takes on human hosts to work his magic.
There have been multiple people who have worn the Dr. Fate helmet and carried on the mantle. Dr. Fate in this series is Kent Nelson.