Masks of Scorpio by Alan Burt Akers

The task of burning out the cult of the Silver Leem had been given Star Lords priority. Although Dray Prescot was emperor of Vallia, still he has to work incognito on an enemy island until that task is done. Sided by his warrior daughter, Ros the Claw, and aided by a valiant crew of piratical swashbucklers, Dray invaded the capital of the secret order only to find treachery and terror where he had thought to find treasure and triumph. It became a battle of golden masks against silver masks, and behind each facepiece could be hiding the bony features of the Grim Reaper himself!

Masks of Scorpio is the thirty-first book in the epic fifty-two book saga of Dray Prescot of Earth and of Kregen by Kenneth Bulmer, writing as Alan Burt Akers. The series continues with Seg the Bowman.