I’ll write one up.
I’d love to play them at higher levels. I think one of the limiting factors they need is to have a limit on how many points they can spend in a round. Right now, they are limited to how many points they can spend activating a discipline, but with so many options for actions, bonus actions and reactions, one Mystic can “go nova” (defined by me as using a discipline skill at the highest setting allowed) up to three times in one round. It’s how I did some of the more impressive stunts.
Now, Wizards, in contrast, can only cast one spell a round, limited to Cantrips the rest of the round, if I’m not mistaken. Having the limit of psi points used be per round instead of per discipline would give more flexibility than a wizard, but keep the Mystic from A, overpowering everything, and B, using up all their points so fast.
Unless using up the points is the deterrent. They’re pretty subpar without power points. Is it, then, ok for them to go nova if they can only do it a few times before having to stay in the background?
As for flexibility, OMG, yes. You can make a Mystic to mimick any other class. Stealthy, Tanky, Blasty, Healy, Skill Monkey, you name it, they can do it.
I almost feel that the Mystic is what the Sorcerer should have been. Instead of making the Sorcerer choose individual spells like a wizard, let them choose spell categories that open up new abilities as they get stronger. Storm Sorcerer starts with Mastery of Water or Mastery of Wind, for example. Just a thought.
Overall, I liked the class. I liked the psychic specific disciplines. The Wu Jen disciplines make you feel more like Avatar, the Last Airbender than a psychic, but it works.
But they do try to be too much. There are too many disciplines, too much choice. I’m not sure how to fix that, but being able to magically know any skill at any time is pretty intense.