The Travellers are members of an ancient, highly secretive order…

… they are chosen from all the humanoid races in the galaxy…

… always female, they are recruited from the ranks of the brightest young things, usually, though not always, when they are still quite young…

… their mission is to visit all the inhabited worlds in the galaxy…

… they travel between these worlds in suspended animation, in ships whose technology is known only to their order…

… as a result of these long spans in transit stasis, they are, chronologically, extremely old. They usually spend decades on a planet, carefully observing every aspect of that places culture and development…

… then return to their hidden home-world to report what they have observed, where that knowledge is stored in a vast archive that contains the greatest collection of such data anywhere in the known universe…

… though they always operate alone, they are far from unprotected, or defenceless… they are trained in the most efficient fighting techniques from all the worlds, and protected by invisible nanotech devices which are basically armoured space suits, so they are impervious to most physical threats, though they are also highly skilled in the arts of diplomacy and threat assessment, so generally avoid physical altercations…

… though their order is secretive, it is also known to the ruling elites of most planets, who buy the services of the orders data analysts, hence the Travellers are generally treated as ambassadors. Their lives are long, and exciting, fascinating, and glamorous.