The Soldier of Earth is the main character of the story for Conqueror, Andromeda, and the first half of Empyrean. In the war on Earth between the UNI and IGC he fought for the UNI in the year 2154. While the UNI was predominantly a Christian force, the soldier didn't believe in any religion. He felt religion was created to manipulate and control people.
The soldier of Earth escaped Earth aboard the ship Andromeda for a period of 5 years, while reflecting on the events that had passed in Conqueror. He begins to view himself as a new type of god[1], and returns to Earth intending to regain control over the planet[2]. As he spends time on Earth, he comes to realize that there was nothing to save[3][4].
When Andara and a group of humans left the Earth aboard Anicetus,[5] Andara transmitted a message to the survivors of Earth asking them to send a message in return. The soldier heard Andara's message and recorded his thoughts and experiences, sending them to Anicetus' AI. Anicetus kept these memories for hundreds of years until Alithea finally used them in an attempt to heal Amyntas after his memory was wiped by Empyrean forces. During this period, when Amyntas only had the soldier's memories, he was called Sentient #2154[6][7] a reference to the year the Soldier's memories were recorded.
The ultimate fate of the Soldier of Earth remains unknown.