o/
Here I go, bringing tourism of all things to the Grim Dark.
While not a tourist per se, it may be more of just an interplanetary traveler perhaps? Regardless this critter is never seen in the same place for very long. Wandering the galaxy, from world to world, cataloging all that it sees for its final expeditionary report when it eventually makes its way back to...well, wherever it came from.
When asked and translation of languages is somehow achieved, it (I keep saying 'it' as the gender is unknown) ominously calls itself the Harbinger of the Old Ones. It says its task is to travel the galaxy taking stock of the current 'child' species who have risen to prominence in their absence. Inscrutable as this may be...so far, the only 'child' races this Harbinger has been known to have encountered have been the Eldar and the Tau.
In the case of the former, it first appeared in the hidden realm known as the Black Library. The vast majority of communications that it has had, has been with the Harlequins with whom the Harbinger has been witnessed to have held extensive conversations. It's language apparently known to the followers of the Laughing God.
Since departing the Black Library, and traveling via the Webway with natural ease, the Harbinger has since had at least made passing contact with the Craftworlders, Exodites, Corsairs, Ynarri and the Dark kin as well. Indeed, the arrival and apparent mission of this Harbinger has caused quite a stir amongst the Farseer community.
Taking its leave of the Eldar, the Harbinger next appeared within the Tau Empire. Welcomed with open arms as is the way of the Greater Good, the Ethereal Caste has been quite taken by, yet perplexed with this curious creature. It has traveled their Empire extensively, often as a passenger aboard Tau vessels, visiting the homeworlds, Orbital cities, the frontiers of the Empire, and most recently the battlezones along their border with the Imperium.
The Tau have been trying to convince this traveler to stay within the Empire, no doubt in hopes of fostering relations with whomever The Old Ones are. However, the Harbinger is growing weary of their hospitality and will likely be soon on its way. Perhaps using the confusion of the battlefield to give its 'clingy' hosts the slip!