Psi-Forms

Races that have unlocked psionic abilities have a chance to unlock psi-forms. Which are psions that have physically died but live on as psionic energy. By default these psi-forms contribute the same as normal population do, but only to things that don't require a body, so to science but not production, ext. They also contribute less than normal population and their number is limited by the number of living psions. The growth of psi-forms is limited by the death rate of psions (if I don't have a death rate, it will be based on life span and population size). This is because lore wise the default psi-form represents a one to one transfer. Where a psion dies and they pass on their knowledge to another psion. I'm not sure the exact ratio of psion to psi-form by default.

Psi-forms will be expandable into other options through further development. Such as creating computers that the psi-forms can control, giving them a way to provide resources psi-forms usually can't create. Or maybe they can be used to give psions greater power/allow non-psions to contribute to whatever bonuses psions give to some degree by letting psions pass their minds into non-psions.