Astral dreadnoughts are serpentine creatures the size of storm giants, each with two gigantic pincers, a reddish armored carapace, and a single cyclopean eye. Their tails are endless, tapering into silver+cords which stretch off forever into the void of the Astral Plane.
The creatures seem to act as guardians of the Astral Plane. They have never been seen anywhere else.
Sources:
Planescape Monstrous Compendium Appendix II
Manual of the Planes
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