I REALLY like this. It's 100% a sad fic, but the way it's presented makes it feel more like someone who's had a deep sadness for a long long time, and who's now coming up on the end of their lives. In the beginning, it's small things, the willows creaking "the same lonely elegy" and the multiple mentions of Rose's failing senses being the things that stood out to me. Then there's the retelling of the memory that goes into just a *little* more detail than what's needed for the point she's making, and the unneeded descriptions of the manor. Finally, it all comes to a head, but not in a particularly dramatic way, but with a paragraph of explicitly missing Rose and the quiet mention of tears on the page. That's what mourning is to me, especially for someone in Rose's situation, a crushing weight that you can't ever get away from that you eventually learn to shoulder. It isn't flashy, it isn't dramatic, and that's a style of sad that I absolutely love seeing.

I also love how you wrote Evil Trace, he absolutely doesn't get enough screen time in the comic, and what little fan-made media is made about him normally just has him as a punchline or has him generically evil. I really enjoyed the mentions of how he was angry and hateful, but also sad, turning the one-dimensional evil caricature I usually see into an actual character. Nobody is evil for the sake of being evil, and adding those lines really helped sell Evil Trace as an actual character.
I also just love that he was a petulant bitch who couldn't take a joke, small side note

Some other small things;
although it was probably because it was late and you were tired, I found that the few grammatical errors and occasionally odd style really sold the idea of Rose being painfully old, which was really enjoyable.
I loved "Four years. To your humans, that must be something akin to an extended vacation." for acknowledging the difference between Keidran and human lifespans, as well as being a little bit of "different perspectives seeing basic things differently" (4 years would be a hell of a vacation, Rose).

The details matter and I thought they were handled really well in this fic, as was pretty much everything else. I don't have a lot of time to read fanfic at the moment, with finals kicking my ass, but I'm really glad that I spent some of my free time reading this. Sorry I don't have any constructive criticism, along with free time I also don't have much mental capacity to spare at the moment.

The focus for this fic is a little scattered, or at least that is the intention. On one hand, Rose had been writing these letters for years, and is mostly just talking to Saria about whatever she's thinking about at the moment. In this letter, she is mulling over how cursed the manor has become, and Trace's sorrow and bitterness piling up on them both.
On the other, her longing for Saria permeates everything. In her old days, her thoughts always return to that, regardless of what she's talking about; she could be talking about something as menial as the weather, but her grieving will eventually bleed through, and it would read something like "it's so nice outside today... I wish you were here to see it." I feel like I handled the theme of mourning really well in this one, and I'm glad you liked it too.

As for Evil Trace, I agree as well. People talk about him like he's a cartoonishly evil villain, but I always saw him as just a very hurt person. Hoping Tom will take things in that direction.

Good luck on your finals! Those are important! I should know, having been stuck in a dead-end McJob for three years.

Skimmed through. Was thinking Rose should use a more old fashioned language, for example, this sentence felt a bit too modern to me:

"I believe he cancelled the lesson to go sulk after that, but I got the core message and a happy memory."

A suggestion: "but I will never forget this lesson and the happy moment we shared". Or something. "core message" sounds a bit to techy or modern.

Oh. And the art at the end of the PDF is a nice touch, I never saw that sketch before.

Yep, was thinking about the "core message" part a bit when editing , but decided it was good enough to stay. You have a point though, it does stick out a bit. Oh well.
There's probably a good reason you haven't seen that sketch before: it hsan't been officially uploaded yet. Someone yoinked it from Tom's stream.

What the hell. That sketch wasn't made till August 30th 2020 but this was made in August 25th

M A G I C

The sketch was actually made on Augiust 23rd, but wasn't uploaded officially until the 30th. Some people upload screencaps of Tom's Sunday streams, so I got to see the sketch early, and wrote the fic the day after I first saw the sketch.