Shilians

The Shilians (aka "Shillgel") were an ancient powerful togruta civilization which existed over 400,000 BBY and reached the peak of evolution and technological progress. As well as Celestials this alien civilization influenced key events in galactic history but unlike Celestials Shilians almost never had any contact with other species because of their neutral policy. They believed that less developed civilizations shouldn't know about their existance until they grow to a certain level. They didn't share any technologies or knowledge (e.g hyperspace bridge) with low-developed civilizations as they were afraid of a high chance of self-destruction or many agressive acts against another species. However, this didn't stop them from secretly observing the alien worlds.

Biology and culture
Shilians were similar to modern Togruta civilization, although it was far more advanced because it was based on science and various discoveries. Shilians were extremely tolerant and kind people. They also believed that only the most intelligent and experienced should lead their civilization. Interesting fact that after their disappearance, they created a misunderstanding among their descendants: "the weak should be left behind". All individuals of their society had an affinity to the force in varying degrees but not all of them were very powerful through. From their history it is known that they have achieved the force sensivity after the decades or hundreds years of gene engineering when they explored additional features of the cell and the brain. In their distant past, they were already actively studying the midi-chlorians even though they weren't force sensetive and had no technologies for space travel.