I love that you filtered the class down and limited the number of diciplines (the original was ridiculous). I would have to do some play testing to be sure but working in the Wai into Monk was a stroke of genius! although it still feels a bit off. like if there was a further class split from monk exchanging some of the monks regular abilities in favor of the psy abilities, maybe an option to take, slow fall for instance, and replace it with an additional Wai option. just a thought.
Glad you nerfed adaptive body to 1/8th smart fix there. but immunity for an hour is clearly broken still. a round or maybe a minute. immunity is incredibly powerful. and being able to give it to the party! it doesn't even matter if you blow all your will points on it to be totally OP. just wrestle the fire elemental to death while your party tickle its feet!
You learn to see and interact with ethereal beings of light
and shadow that others cannot see. You can request one of
these sentient beings to assist you. With this discipline, you
use your ability to shape energy to temporarily bind agreeable
consciences to physical forms.
I like that you combined all of the summons to one (at least thematically) but the description is weak. and binding spirits to the elemental sounds a bit witchy and magical to me. maybe something more: you have learned that all of matter and energy consists innately of a balance of shadow and light. by subtly manipulating this balance you invoke a primal rift through which elemental energy eagerly enters the material plane. The elemental disappears if you lose concentration because the balance automatically reverts to normal banishing the elemental immediately.
I stopped looking at the revised disciplines, for now. but it seems to me that the disciplines are not allocated in a balanced way. the psion particularly seems to get the best abilities: summon stuff, giant growth or shrink, psychic blast and black dragon breath. If it were my home brew (just to give an opinion not a criticism) i would drop the psion all together. making 3 subclasses. then I would limit the disciplines each class can take to its own discipline or to an "open list" which would consist of the psion abilities. and no others. an awakened cannot take an immortal discipline but it can take from the open list. maybe give the soul blade a few disciplines of its own and you are done.
there are my 2cents. overall it is a HUGE improvement on the Mystic class thank you for your clearly hard work!
P.S. diminutive is still ridiculous to me; at the very least it needs to have its movement speed nerfed to the new size. half size half speed. quarter size quarter speed etc. seems appropriate if a little too generous really.
P.P.S. also, for magic and psionics; not only is it easier to make them on the same ground for resistances etc. it makes good sense thematically. Wizards tap into this thing, magic, to create and change the world around them but it follows strict rules. think of it as a 5th force in terms of the nuclear weak force, strong force, elector magnetic force, gravity and magic. it is a science. Psionics does the same thing, tapping into and manipulating these forces, the difference is the method and varying cost of completing the task. teleportation is relatively easy for a mystic to do while melfs acid arrow or tensers floating disc or magic missile is relatively difficult. like chemistry and biology trying to do the same thing. some will have to put for tremendous effort while the other relatively little effort to do the same thing.