This is a splinter faction present in the Shadow campaign. It is hinted they are old experiments of the AI which led to the known Hybrids. The Astrid may have broken free from the AI and became an independent splinter group.
Extract from the Shadow campaign journal "Shattered Pillar Zenith Found":
We've run into a lot of AI-modified Neinzul since the war, but we thought it a relatively recent development. Apparently we were wrong. Bioscans are 100% that we're looking at Neinzul, but the construction is consistent with one of the first iterations of the Langstrom AI. Inauspicious heritage, you could say. Xenobiology is calling these hives the "Astrids", and I have no idea why. No warp grid emissions or other telltales of AI communication are present, but we have no idea if these Astrids would link back up with their erstwhile masters if given the chance.