The Tides of Kregen

Blurb

The Tides of Kregen is a science fiction novel written by Kenneth Bulmer under the pseudonym of Alan Burt Akers, and is volume twelve in his extensive Dray Prescot series of sword and planet novels, set on the fictional world of Kregen, a planet of the Antares star system in the constellation of Scorpio. It was first published by DAW Books in 1976.
The Dray Prescot series is made of several cycles of novels, each cycle essentially forming a series within the series. In addition to being the twelfth volume in the series as a whole, The Tides of Kregen is also the first of three volumes in the Krozair Cycle. It is set on the fictional continent of Turismond as well as the island of Valka and Earth.
The 52 completed novels of the Dray Prescot series were written by Bulmer between 1972 and 1997, when a stroke stopped his writing, also the later Dray Prescot books, after 1988, were originally only published in German. The series is in the spirit of Edgar Rice Burroughs John Carter of Mars series.