Intro
Alright, so this is the reply that discuss your custom class tree that you’ve made. I’ll probably check your shadow tree later, but otherwise, here is the TLDR for the majority of people who might not care about the long post: Some fun stuff, some OP stuff. There is good and bad and overall placement seems great I feel. Good work.
Now, here are the general comments on the tree. No suggestions yet, just comments.
Section 1
While the theme of having life and death of the first row is interesting, I feel it’s really a strong option that comes with no cost for when it’s needed. And holy, the spec that starts with this option, is probably the spec that needs it the least. It’s like a constraining Serenity. Most holy priests I know don’t care all that much for this and would rather get PoM by default, which makes a lot more sense for the toolkit. That’s my opinion though, but I’ve seen quite a few holy who couldn’t care less about HW:L (at least as a capstone)
I know that blizz did this as well, but I’m really not a fan of disc getting both holy and shadow options on top, why not get a power word option? Since shield is not used much by shadow/holy maybe it should not be baseline (in favor for something else) and disc start with a central PW:S option? (just brainstorming as always)
I feel the 1st section is a bit bloated. There are too many things to pick, I pick my 8 points and I don’t have room for all the utility that I would need. This is exacerbated by the other sections providing a lot of good picks as well, making me not want to come back and get more than the 8 talents that I put in initially. Shadows seems fine as it has some choices to make here though. This is mostly a problem for the 2 healers. Pathing seems nice, I also like that you moved some strong options to section 2.
Prayer of healing
Holy has already seen a portion of its toolkit taken away from them (to be put into the class tree). Their current tree is a bit empty tbh, so I’m not sure how I feel seeing yet another holy ability here. They have like 23 talents total for the first 2 sections of their tree so they have basically no choices to make, and you’re reducing that to 22…
I feel holy is pigeonholed into going left side. While right side could be interesting in m+ for the damage components.
Searing Pain So you can infinitely spread your SW:Pain without any costs. Even in the shadow tree, this is too strong imo. The spreading should cost something at the very least (cd, proc, insanity/mana)
This is super strong for healers as well and invalidates PotW for disc, which is a big reason to take that option in the first place (for easier spread)
The damage reduction is too strong as well. Sin rogues have a similar option that have 10% chance to proc on attack with a specific poison AND is 3% reduction. This talent is really too strong to be able to do both: spread SW:P for free as well as overpowering sin rogue damage reduction by a mile…
Translucent Image/Phantasm
I feel this is quite strong for a tier 1 talent. And it’s free because of it’s placement, there isn’t really a reason not to get it when you need it.
Thought Harvester
I feel this is interesting, but might be a bit too strong for our healers, and more specifically disc. But interesting idea still.
Masochism
Current masochism has some usefulness… This promotes for the squishiest healers in the game to hurt themselves for mana. Not a big fan of this one 
Section 2
Number of talents seems more in line with other trees for section 2. Pathing makes it so that you can easily unlock any path for the last section if you want (Although might be some wasted picks for some specs that we’ll discuss later)
**Clerics Armaments **
Way better path to allow for disc to go there. Although I find this hard to be a section 2 choice for the other 2 specs. Shadow and holy don’t shield themselves as it’s mostly a waste of global/mana. Pre-fight shielding is an option as well as playing with Body and Soul, but still a bit meh.
Smitten
Not a big fan of seeing this here. I feel it would be a bit strong for holy AND this pigeonholes healers to dps with smite even in AoE situations. It’s a cool option for sure, but I feel it’s way too strong
Archangel
Kinda forced into picking this. It’s fun, but healers already have their bars full honestly, and sometimes, you look into options to reduce the number of buttons you have to press. This is the only way to get mandatory utility like mass dispel or PI. Dark arch could increase damage done (not just shadow), Healers might find this option more appealing if they want to help/contribute to damages
Mindfull words
Interesting, although I’m not a fan of this being behind MC. Sounds fun in terms of interactions. Could be dangerous with Death/Life 
and might be a bit hard to balance with the stronger words maybe (Barrier for example). But alright!
Shadowfiend/Mindbender
Interesting new option to do something different while they are on the same node. I feel shadowfiend is going to be mandatory pick for shadow, but that could be fine. Might be a bit strong but I guess it can be tuned.
You are kinda forced into either AoE or MindControl options to go there. As disc I feel I wouldn’t want either for raid content (To get to mindbender for damage & mana) So pathing could be improved I feel.
Paralysis
This should be psychir horror. Shadow has 2 of these with your setup, this will be hella strong in pvp
Section 3
Light/Dark of the Naaru
Interesting. Although I feel you’d have to waste a few points to get there as shadow. (At least 6 points that aren’t so nice investment-wise) Feels bad to “sacrifice” that many points even if it could be worth it.
Crystaline reflexion
Better placement than the original tree. I feel this is still a wasted pick for holy/shadow still. And the 2 points version would probably be too strong for disc.
Inner focus
I feel this is a bit OP for disc, to pop before ramps… that’s basically a free ramp every 2 ramps. Disc mana is heavily constrained in raid to balance it, so this won’t do I feel.
PW:Twilight
Interresting idea. Although a bit too rng to my liking. It’s more a disc thing again, and disc has to properly setup everything for incoming damage. The RNG factor in this makes it a lot less interresting, I’d always want this to proc on the tank, and it will likely never do so. (Just an opinion ofc)
Leap of faith/Vault of heavens
Weird placement. I feel this should be higher in the tree. This is a mandatory pick for priest (imo) and having it in the 3rd section makes it so that you want to put your 10 remaining points in the strongest throughput talents. We’re kinda loosing our wings if they’re here I feel.
Mind Bomb
Really interesting pick for M+. Might be a bit strong pvp-wise as you can’t really dodge this if you are the target. Might be interresting if it’s the caster (or a friendly target) that would cause the explision (would feel a bit more balanced at least, since ennemies could dodge if tweaked properly)
Reconstituted Power
We’ve already discussed this. I still stand by my points. But I’d add that it could be ok-ish because of it’s placement in the tree. Could have to sacrifice throughput to pick it. Shadow priests that are asked to give their PIs to others might have to sacc 2 talents there since you’re not adding Twins of the sun priestess in your tree…
Void Tendrils
Quite flavorful, I like. 1 hit to kill the tendrils? are they killable by AoE? Feels like this could be exploited in m+ and could be a bit strong in PvP again. depends on how the numbers can be tweaked. Keep in mind that healers can use these as well in pvp…
Petrified
Interesting idea as well, definetely would use in m+ if I can spare the point (Although I have to chose with other cc options 
) Could be a good choice to reduce button bloat for sure.
Cascade/Dark Cascade
This feels too strong for a lot of cases. CD is short as well. I’d imagine shadow priest could be asked to spend a point here for some fights if the healers need a bit of help. Dark version could be interesting for healers in m+ for organized groups that do big pulls. Sounds fun though. You’re also forced to pick AoE/Stuns to get to this, if you’d want to go that way for raids (For healing) this feels a bit off.
Spectral guise
6 secondes freecast time for healers in pvp sounds a bit dangerous. I know this is a fun/historical hability. Cool stuff. Might be too strong in class tree still.
Mind restraints
This is a basic talent for disc that is super deep in the tree. While it is OP for shadow I feel. I’m still not sold to the idea that this should be in the class tree, no matter where this is…
Void Shift
I feel this is really too niche of a usecase. I would never pick this up, at least as a capstone or even in the 3rd section (just my opinion). I guess shadow could make a bit use off of it since it can heal itself through damage a bit, but even then, it would be better off higher in the tree if we’d want to have this.
Exsanguinate
Interesting option. Could be a bit strong for disc. This would have to be off atonement healing… and it would lose most of its appeal then… Would have to be toned down a lot for pvp as well…
Mindgames
I like that you have to chose for either aoe or single target. My problem with this is more with it’s placement. This is an ability that see a lot of use in pvp for all tree specs, but you’re forced to pick fiend/mindbender and rabbit shadow to get to it, which isn’t necessarily something you’d want as holy for this context (for example) SFP makes sense here because it doesn’t work without those options.
Overall thoughts
For shadow, I feel that there isn’t much way to go to the left and not waste points (to get to dark naaru) The options seems fun but it feels bad to give up 6 points to get there. Otherwise, there are more options to chose from depending on the content, feels better than the current alpha tree for this. Unwavering will, Crystaline reflextion and inner-Focus/Twilight seems wasted for shadow (assuming we could go there easily)
For disc, the top of the tree offers too many options with too few choices. I feel like I’m constrained on picking things I don’t want a lot of the time. Ex: for raid or pvp, I might want to go with PoM and not mind sear, this makes me have to pick Mind Control to go the mindbender way (which ok for pvp, but likely not for raid) I feel like some options will never be picked because there are so many interesting stuff to chose from and so few spare points (ex: shackle undead).
Second section feels ok-ish, feels like I really have to think things through here because there are a lot of interresting options that feels mandatory rather than have a few mandatory options + some flavor/utility that I could chose from depending on context.
3rd section feels like there are a lot of really strong options for disc. While this is fun, it feels like some options should be nerfed to nothingness for disc OR for all three specs at once (See each of these respectively for more info)
For Holy, top section is even worst than disc. Too many choices, too few points to spend. HW:Life is hurting as well because you have to spend 1 point to get to PoM… You also have to pick ShadowMend to get to Mind Sear if you want to go the m+ aoe route a bit.
Second section feels a bit bad in that case and you’d endup spending some points back into the left section of the first tier if you want to go to the Naaru capstone. (I guess this is ok-ish)
For healers, I feel we might be getting a bit of button bloat. I’ve got more than 3 bars worth of keybinds as both healing specs RN and we’re adding silence+Archangel and gaining a good 2-3 abilities in the last section (without even playing in the spec tree) While we can gain a few slots by not selecting them like shackle undead or mind control, etc, still feels like there might be to many activated abilities to be gained in the bottom section, would have to see the real thing with class tree to be sure though…
