All right! The recent changes to psi are pretty damn good, but the new system could still use some fine-tuning. Namely, the innervation mechanic.
Why is that, you ask? Well, right now all psi abilities are treated like they have the same power level (all of them take one innervation slot).
Is, let's say, Enrage really equal in power to Disruptive Field or Cryo-Shield?
What I propose:
1. Instead of innervation slots, INT should provide points of Psi-Cognitive Capability (PCC). One point of Intelligence should provide 2 points of PCC. This means 24 points at 12 INT (maximum).
2. All psi abilities should have a new property: Innervation Compexity (IC). IC should have three levels: Low (1 point), Medium (2 points) and Difficult (3 points). One point of IC corresponds to one point of PCC, of course. This way, the character with 12 INT will be able to innervate 8 strong, 12 average or 24 weak psi abilities.
3. Assigning IC to individual psi abilities should be pretty intuitive, I think.
1 point: Disruptive Field, Cryo-Shield, Telekinetic Proxy, etc.
2 points: Cryokinesis, Electrokinesis, Neural Overload, Telekinetic Punch, etc.
3 points: Enrage, Psycho-temporal Contraction, Thermodynamic Destabilization, etc.