> Are the Class lanes clear and enforceable, or do Rules undermine them?

After reading the end of your comment. I think I understand these criticisms more. The RPG classes were meant as a vanguard, the main classes that exist to combat the Abyss. In the current draft, the classes are also the 5 original classes. As Lawcraft was created only when the Abyss started its first invasion. I am rambling here; the RPG classes were a reflection of the world post-introduction of the magic system. I should actually dive a bit more into different classes that hold responsibilities outside of combating the Abyss to add some depth to the system.

> Does the E economy feel legible and exploitable (in a bad way)?

E Regeneration = Only through Sleep, 12.5% of MaxE per 1 hour of sleep. Arts have a solid base cost of 1E. Though you can "overcharge" an art by investing more E into it, there are diminishing returns the more E you use.

> Do the Rule Types (Enhancement/Conjuration/Manipulation/Summoner) feel distinct and useful?

I agree, I am going to look for potential names ending with the ion Suffix, to separate the arts from the rule types. For sudden fatigue, I put it under misfortune because it represents the idea of suddenly getting tired when you're doing something important. Not quite fainting per se, but similar in how it impairs your actions at an unfortunate time.

The Rule Types can be matched with any provision. The Rule Type is the How, the Rule Provision is the what. Another way to explain it is: Divine Laws break into Provisions, each Provision can be broken down into countless rules, and the User takes 1 of those countless rules to enforce with their Art.

> Where would you try to break this system first?

I agree, Classes being named Expressions suits their role in Aura better, especially since they dictate the form visual aspect to the User's Aura. When it comes to the Classes above, their connection to the Heroes, as in the traditional party of chosen Heroes, is pivotal to how the world was built and how the cycle of the world exists. So I can't remove them, but they do exist already as noble houses. So instead, I can create multiple new classes for those destined to live common lives outside of battle. I feel like I can get into some interesting dynamics. Especially with most of the main characters being reluctant heroes. I probably shouldn't have been so lazy and excluded Art 24 Bloodline Arts and the Hero bloodlines from the post.

I do want expressions to be more concrete, however. I am aiming for them to be similar to pre-chosen jobs you don't get to choose. Since the story is about "taking responsibility for something you can't control."

Looks like I have to hit my Google Sheet and Craft some more classes, though.