A strange race of Psionic, Hivemind millipedes perfected the technique of "peasant railgunnery", ie, using a long line of synchronized telekenetic energies to give incredible speed and force to ordinary rocks. They build massive fortresses of rock packed in such a way that it actually becomes crude adamantium using said technique. They are long, thin, spindly, spiralling tunnels which the millipedes spiral through. The adamantium has the properties fast, breaking, mind. It can be forged into armor or weapons, if properly stolen and forged.
They absorb mental energy from all things that they "eat", and are changed by the energies they consume.