Made my own moth species and plan to make some custom models
For my own, I came up with a moth like creature that build dyson sphere worlds around dim burning stars that they'd make from something similar to wraith bone, some would also occupy small moons and planets.
They'd cover a few different star systems with each housing a different sub species with its own design and cultures with one viewing cannibalism as something sacred and consuming loved ones in their culture.
The species would be highly suseptible to Chaos, specifically slaanesh and tzeench. However, wouldn't see it as a threat and would more so see it as just another power system. Their species would be highly backstabbing and removing threats and rulers through deals and assassin's rather than war, tzeentch would love this. However whilst very scheming they tend to be a very peaceful species and even view the tau as a potential alliance. Most of their culture would be centred around indulging in pleasures and luxuries with the goal to make the most out of life that they can trying to experience every possible sensation.
Depending on the sub species their life spans vary drastically, from 100 years to 5000, this effects individual world cultures.
As you've probably guessed their attacks are mostly psycher abilities