Every biological species in Stellaris has the potential for rare individuals to develop psychic powers. By pursuing the Psionic Ascension path, you can make every single person in your empire a psychic, able to communicate telepathically and perform dazzling feats with only the power of their minds. Psionic empires have unmatched unity among their people, but risk allowing malevolent entities into the universe.
Related: Stellaris: Biological Ascension Guide
The Psionic Ascension path unlocks several exclusive events that are not available anywhere else in the game. It's a high-risk, high-reward undertaking that promises unlimited power or cataclysmic ruin.
Spiritualist empires are by far the best choice for aspiring psychics. This is because once the Psionic Ascension path is undertaken, your population will begin to favor Spiritualism more heavily, so it's best to go with the flow. The additional Unity produced by the Spiritualist Ethos will also be useful in administering your empire throughout the game.
Psionic pops get a bonus to Research and Energy production, so starting the game with traits like Industrious or Intelligent can set you up to maximize those yields down the road. Traditional is also a useful trait if you plan to start or become Spiritualist, since it further boosts your Unity production.
Avoid researching robotics technologies if you're pursuing Psionic Ascension. Spiritualist Factions hate artificial life, so your empire will be much more stable if you just outlaw AI altogether from the Policies Tab.
Since one of the benefits of Transcendence is improved Espionage, choosing Civics that improve Codebreaking such as Cutthroat Politics or pursuing the Subterfuge Tradition tree can make your psychic
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