The Lords of Harmony: A Tale of Two Sisters

Genre: Adventure, Dark, Mystery

Wordcount: 53,410

Grammar: 9/10.

Mostly good, deducting a point for the title having a masculine term (Lords) which presumably refers to Celestia and Luna (who would rightly be called the Ladies of Harmony)

Characterization: 9/10

Somewhat heavy-handed, but it gets the Mane Six's basic characters down without turning them into caricatures.

Use of Show Canon: 10/10

Remembers the Pony of Shadows, the Alicorn Amulet, Trixie's use of it, and multiple other plot points.

Plot Consistency: 10/10

No plot holes as far as I am aware.

Plot Coherence: 8/10

Docking points since it's an as-of-yet unfinished story tagged 'mystery', so I'm not yet sure how it all ties together.

Genre: 10/10

It's tagged as Adventure, Dark, and Mystery, and it's been quite a dark and mysterious adventure.

56/70 or 80%

Verdict: Accepted.

It's not perfect, could definitely use some tweaks, and is not the most original of stories. That said, if you're looking for worldbuilding or backstory on Celestia and Luna, this might be the fic for you.