The Ti'Derg Homeworld

… was the homeworld of the Ti'Derg roughly 1.2 million years ago, a client species of the Irassian Concordat. They were winged arthropoids, and recovered fossils suggest they were capable of at least limited flight - what little we have seen of their surviving architecture supports this theory. Unfortunately, there are few remains of this civilization, as the … seems to have been subjected to a massive orbital bombardment.

The command below will trigger the "The Ti'Derg Homeworld" event in Stellaris:

When this event fires, you can choose between the following option:

• Intriguing.
  • Start special project: Ti'Derg Homeworld