Doctor Fate #4 (2004)

Once the Lord of Chaos is defeated, everyone returns to the Tower of Fate, but Nelson has had enough. Eric and Linda try to talk to him and convince him to stay and help them in their new quest as Doctor Fate, but Nelson refuses. He tells them that all they need to know is alredy inside them and with one final request, he asks Nabu to let his body die.

Eric, Linda and Nabu bury Kent's body outside of the Tower, but as they contemplate the unfair ending of Kent Nelson, Nabu is snatched from Earth to the dimension where the Lords of Order exist. They have decided that Nabu is not fit to remain on Earth anymore, as he has lost the true purpose of serving order and just order. However, Kent's sacrifice has allowed Nabu to see the world differently and he now understands that there is more to life than order and chaos. Nabu refuses to join the Lords of Order, instead choosing to fight the forces of chaos on Earth alonside Doctor Fate, even if it's a lost cause. The Lords of Order understand, but as they send Nabu back to Earth, they officially exile him from their realm, never to return. Nabu is sent hurling towards Earth and upon his arrival, he destroys the Tower of Fate and all its surroundings, including Nelson's tomb.

Back in New York City, Eric and Linda try to understand all that has happened, and although Linda wants to experience her love for Eric, he knows there is still much for him to learn. After all, his mind and body went through an aging process to transform him into an adult and things are still very strange to him. At that moment, someone enters their apartment and they are both shocked to see it's Kent Nelson. The man, however, reveals himself as Nabu controlling the body of Kent and he explains that he has returned to guide them and help them on their mission as Doctor Fate. Eric and Linda accept his offer, but Nabu insists on simply being called Kent.