Well, here's what I have so far. I focused too hard and went too deep, and that's a dumb idea. It's pretty clear no one edited the chanter's abilities for capitalization, and there are a ton of style inconsistencies. I saw some spelling errors in your text and thought you might need more help, but now I think you did almost as well as the original writers, frankly. I think your biggest error was capitalizing class names, which was not done elsewhere in the game.
I will not go over all the stylistic or capitalization inconsistencies. That just seems ticky-tacky because Obsidian didn't watch that well themselves. I don't blame them; I bet editing this amount of text from so many stylistically different writers already drove their editors mad. I'll just point out the more noticeable gaffs.
Issues of greater importance are marked with an asterisk.
General:
Extra Pocket (PL5 passive): The "p" of "pocket" in the title is not capitalized. "Tab" is an unusual, anachronistic word choice here.
Fast Empower (PL7 passive): The final clause "gain +15% action speed until end of combat" is independent and should be its own sentence or linked to the previous clauses with a "then gain..." or "then the character gains...".
Great Soul (PL8 passive): "Resource" is spelled with only one "s". The phrase "Also resources per class:..." could be clarified by adding a verb, such as "Also gain resources per class:..." or "Gain bonus resources depending on class:...". Also, class names are capitalized here when they are not elsewhere.
Barbarian
Berserker (PL0 subclass descriptor): In the Bonus section, "carnage" should be capitalized. Note that the word "carnage" does not need to be capitalized in the upper description text because it is not necessarily referring to the literal game term.
Frenzy (PL1 active): In the Berserker's subclass bonus description "carnage" and "confused" should be capitalized.
*Flesh Communion (PL0 subclass descriptor): A comma is needed between "corpse" and "healing". This is also a very confusing skill to read. What does costing -1 Rage mean? When it says "+3 of each Barbarian resource" is gained, what does that mean? Just Rage (the barbarian resource) or all resources this barbarian character has access to? Does that mean they gain +4 Rage? Also, class names are not usually capitalized in ability text, so this is not stylistically consistent.
*Mage Slayer (PL0 subclass descriptor): It'd be cool if "Spell Disruption" had a tooltip or was described specifically.
Brute Force (PL5 passive): "Fortitude" is correctly capitalized in the summary but not in the description paragraph.
Vengeful Defeat (PL8 passive): The parenthetical sentence needs a period.
Chanter
Bellower subclass description: "Collections" should be "collection" (singular) and the final sentence's "the" should be "their".
Shatter Their Shackles, Cast off Their Chains! (PL2 active): The summary says it makes characters immune to Dexterity afflictions, while the description text says it removes them. Does it do one of those things or both?
...Its Crash Could Not Be Denied (PL4 active upgrade): Description says it gains an Accuracy bonus, but how much is not stated in either the summary or description.
Together They Slew Forth a River of Red (PL5 active upgrade): Does not specify how much bonus damage the charmed enemies get.
*...Each Kill Fed His Fury (PL6 active upgrade): The summary says it grants the Fit Inspiration, but the base ability does not and the upgrade description does not mention this either.
The Foul Thing Gave One Final Gasp (PL8 active upgrade): The upgrade description should have parentheses. "Gaz" should be "gas" and "sickens" should be capitalized and blue.
Cypher
Echoing Shield (PL5 active): The summary says "Foe AOE: Immunity to Concentration attacks." I know that's in the base game, I'd just like to know what the hell it means. This is just the dumbest wording, gahhhhhhhh.
Ancestor's Memory (PL7 active): "Allies'" should be "ally's".
Defensive Mindweb (PL8 active): The description ends with two periods.
Biting Whip (PL2 passive upgrade): This is a little hard to parse. I think the summary might mean "+20 Damage with weapons, +20% of weapon Damage dealt as Raw", though it's not clear if the second 20% is the base or total damage. Also, "raw" should be capitalized in the final sentence and that sentence does not need a comma.
Psychic Backlash (PL3 passive): The summary says one use per encounter but the description makes it seem like it is activated every time the cypher's Will is targeted.
Keen Mind (PL5 passive): The summary says +1.5 focus. That's tiny! I have no idea what this means.
Brutal Backlash (PL5 passive): Needs a comma between "traumatic" and "inflicting".
Protective Soul (PL9 passive): "Self when critically hit (when critically hit):" is redundant. The second comma in the description is redundant.
Whew. Is this valuable at all? Going over the chanter ability names broke my head a little.
