Zeta Exchange: A Terran Empire story

"Zeta Exchange: A Terran Empire Story" by Ann Wilson is a science fiction novel written in the early 1990s. Set in the year 2669 CE, the book follows Ranger James Medart from the Terran Empire as he gets summoned to a different universe that requires his assistance against a formidable enemy known as the Sandemans. The narrative explores themes of alternate realities, magical abilities, and interstellar conflict, challenging the boundaries between technology and magic. The story begins with Medart enjoying a peaceful journey aboard the Empress Lindner when he is unexpectedly transported to Zeta Prime through an inter-universe summoning. Welcomed by Ranger Ariel of Rolian, he learns that the Zeta Prime Empire is under siege from the Sandemans, a race of genetically-engineered warriors. As Medart collaborates with Captain Chavvorth, a Traiti officer, and delves into this universe's magical practices, he discovers that he possesses untapped magical potential. Despite the odds, he must rally resources and ally with the Sandemans, whom his universe considers adversaries, to end the conflict. The novel culminates in a life-or-death duel that tests Medart's newly learned abilities and ultimately leads to a pivotal transformation in the relationships between various factions, reshaping the future of both empires.