With Psionic Mastery (p. 5) you gain Special Psi Points (PP) that you can spend on multiple Disciplines how you see fit. I have a couple questions about this feature due to its lack of clear wording.
Are you still restricted to your PP Limit while using these Special
Points? Since Mystics have a PP Limit of 7, and the effect gives 9 (and later 11) Special Points; could you use those 9 all at once,
breaking your Psi Limit?
To me, the wording suggests that you are able to do this.