Titans

Titans are a space-dwelling species(probably there are several species of titans), it is unknown if they are sapient(probably not), but it is sure that they don't have technologies, but their physiological structures allow them to travel around the space and shun potential dangers.

Titans are huge, as they are not bound by the gravity of any planets but the gravity of themselves, the body size of a titan can be up to several hundred kilometers, and the average body size of Titans is comparable to asteroids, so they are one of the largest life forms in the galaxy.

To protect themselves from meteor impact, all of them possess thick shells made of rock, which make them look similar to ordinal asteroids, however, they are actually living things, as they can intentionally change the direction and speed of their movements to shun dangers or seek for certain resources, and do sometimes attack spaceships.

Titans are unable to perform FTL travel, in fact, most of the time, they only float in the space to spare the energy, and only change their speed or direction by jet propulsion when needed; also they only live in certain places in the galaxy, mainly in some specified locations of inner Sector 6(although some living specimens have been found and seen in other sectors of the galaxy), but it is known that the Star 6-220-203-401-49 located in inner Sector 6, whose planets and asteroids are unusually abundant in lanthanides and other important minerals, is an important breeding site for Titans.

It seems that titans can live indefinitely, and they don't age, so if they are not killed, they are likely to live forever.

It is known that Olgrns have ever built space facilities on the body of some titans, but most of them were eventually destroyed, even though titans don't even know the existence of such facilities, as titans regularly abandon their old shells when new ones are grown.

It is unknown if titans are sapient, but it is for sure that titans are smart enough to learn to shun and fight back against almost every attack from spaceships.

Titans are not undefeatable, they can be killed by throwing several powerful bombs like nuclear bombs into their mouths, but since it requires enormous efforts and resources to defeat any of them, most people choose to simply evade them, rather than fighting against them.