Question,
Primus will be able to see the dragon next round. Instead of using my strongest powers, I can use Evo Whip, which only costs 3 points. It makes it so the only thing the dragon can do on its turn is dodge, hide or dash. It would keep it from attacking at least.
Or I can do guaranteed damage. It’s like Magic Missiles, but does 6d8 of psychic damage, no save. Not huge, but no save and no other effects.
Those would be taking a lot of my points, though. I could do 2 ego whips for one Psionic Blast. But it can possibly save against my Ego Whip, but not Psionic Blast...