Okay, so I read some more now. I focused mostly on the heroic tier powers, since I feel they are the most important (to me). I skipped all the stuff that I saw had already been discussed.
The Martial Artist
First of all, I really like what you did with the class. While the divine part is arguable (and not really how I would do it), it is so easy to change that it is not even worth wasting these lines on it

. The only issue I have, is the Quick-strike. I see how it gives some added versatility to have it be an additional roll. However, I prefer a keep it simple approach, and was wondering if you think it would unbalance the class to just add the damage, much like the ranger does. My gut says no, but I would like to get some feedback on it
- Serpent Bends Aside: Is it supposed to deflect magical attacks as well?
- False dead: Is it supposed to be usable in combat? If so, shouldn't it be an immediate reaction?
Nature Priest
Love this class as well. Awesome job.
- Lightning Fist: Shouldn't it’s secondary attack be against reflex?
- Gust of wind: Push 6 really sounds like a lot. I get that it's a classic druid thing, but 6 squares?
- Sphere of fire: Why does it give -2 to attack rolls? Ongoing damage seems to be the fire shtick these days. What causes the penalty?
- Heavy fog: Is there some height rule to it, that I have missed?
- Slashing tree: Why suddenly use cha to attack, all other attacks use wis from what I noticed?
- Bramble wall: That is a sweet power, but maybe the 1 hour duration is a bit too much. Do we have examples of other powers with similar durations? Maybe 5 minutes would be enough?
- Entangling terrain: Why only up to 1 minute duration? Sustainable stuff can be sustained for the encounter, normally.
Savage Warrior Relentless Attack
Once per round, as an opportunity action, you may make a basic melee attack against an adjacent foe who attacks one of your allies with a melee or ranged attack.
If an enemy makes a ranged attack against anyone, while being adjacent to you, you already get an OA. Do you get another, or is something else?
- Staggering blow: shouldn't this be a push effect?
- Interposing strike: (see above)
In general, I must admit that I am not too happy about the barbarian. I see it as either the defender who hits hard (being able to take a lot of punishment to make up for the lower ac) or as the striker who hits really hard, while being able to take some hits (lots of big hulk smash hits). This barbarian feels a little bit too controller-ish or something. I see what you did, with the powers that crit on a 15+ (might want to mention that it assumes a hit) but it feels a bit too random. Which is a pity, because you really seem to have captured the feel, with many of the other powers.
Troubadour
Love this one as well!
- Soothe the savage beast: No reason why it cant be cha vs will – the bard should be a better “sleeper” than the wizard. Having to use a secondary ability for one or two powers is a tad odd, design wise, at least imo.
Spellbinder
Not really sure about this one. I like the class, but something about it feels underpowered. However, I can't quite decide why, so for now, I will have to wait and see.
All in all, a great book, thanks for writing it, Ari.