"The World-Ship of Ydar... ...was a monster, vast, implacable, and set on a collision course with the Galaxy of Man. Giant starship and mobile world, Destiny of Ydar is both refuge and vengeance of a long-dead civilization which must be stopped, or worlds will die. The cooperation of the Ydarans is vital. To bad they're caught up in a civil war just now. Too bad, too, that they've forgotten the rest of the universe exists..."
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