Cosmocetus

The Cosmocetus also known as Ghar'Ilid or Astrocete is a large space whale that can typically be found in deep space and is believed to be sentient. They are a subgroup of a larger sentient and fantastical group known as cosmo-aequoreus or space marine.   They are a shy species that typically stay away from busy space. It is not wholly uncommon for them to be found on the edge of civilized space but even then, that is mainly due to migratory routes. They are insanely rare to come across and those that have met them speak of the stories they were told from the whales. One such scientist, Doctor Caelan Pearce, is known to be one of the only ones to be invited in to the whale's rituals and gatherings. But even he has stated that they followed far, far behind the whales due to the cacophony of their spaceships. And during observations, would shut down the ships entirely besides the basics to not bother the whales.   To be in the presence of one is an honor, to be able to initiate and enter into conversation is an entirely different thing entirely. These whales are thought to be nearly immortal, watching as civilizations rise and fall, being present for the birth of stars and saying farewell to those on the verge of going supernova.