OK, short break from heavy aesthetic slogging. I made a psionicist class for Next 52 Pages and the rules can with little effort be ported to any other system. The spell schools are Enchantment, Divination, Alteration and Destruction (fire, force).
While making it a balanced option I have also tried to preserve the rarity and elitism of the class ("Wow, Skip! You tested psionic!") and the possibility that they open the party up to a whole new kind of attention and danger from big-brained mutations. It's not quite the long-range sensing and communication of the Hiero novels but maybe some more Divination spells in that vein could be added.