They have based their entire technological development on the use of psionic energy, which is emanated by their own minds and controlled and augmented by psychoactive minerals found on their own homeworld. In other words, their technology consists basically of stones, which can enable them to perform numerous psychic feats, including telepathy, telekinesis and teleportation. They are also able to assume an illusory appearance and to project illusions which can actually interact with the world; so that a telepathic projection of them can be almost as deadly as the real thing. One ability that they lack, though, is that of hypnotizing or controlling minds.