As far as I know, Masteries 1&2 have interchangeable SP, as do 3&4, 5&6, 7&8, and 9&10. You cannot save SP from Mastery 1/2 and use it on Mastery 3/4 etc, but you can waste higher Mastery SP on lower Masteries.
This is evidenced by the fact that Evan SP Resets are divided into said five groups. If you can SP Reset points between 1&2 but not spend as such, it provides a retardedly large potential gap between NX and non-NX users. Unless these SP Resets are a blanket and only do apply to each specific mastery.
This is evidenced by the fact that Evan SP Resets are divided into said five groups. If you can SP Reset points between 1&2 but not spend as such, it provides a retardedly large potential gap between NX and non-NX users. Unless these SP Resets are a blanket and only do apply to each specific mastery.