weight at 1st level of mastery, 90 g.p. (30 + 60) at 2nd, 180 g.p. (30 + 60 + 90) at 3rd. 300 g.p. (30 + 60 + 90 + 120) at 4th, 450 g.p. (30 + 60 + 90 + 120 + 150) at 5th etc. Duration is a function of the psionic strength of