Commenting, and things not to say

This is all in reference to this story, which is where I would be posting this except I seem to have been blocked. Or at least I think I have. The error message I got when trying to post this was incredibly vague and unhelpful (Failed to post). Anyways, long story short, to say that the comments on that story have been contentious all around would be an understatement, during which I let my... enthusiasm for complaining about things get out of hand.

So, I would like to apologize for some of the posts I made. They were out of line, and I'm sorry.

I'm fairly certain the person this is directed at will never actually read any of this, but it needed to be said.

---

As for the chapter, I'll try being at least somewhat constructive for a change:

Have the Mirror Guard prepare to transfer to the Hornblower by flight and by longboat.

So Alternia knows that Celestia's fleet is under attack (and nearby enough for them to see the cannon fire) by Seaponies (capable of knocking fliers out of the sky) and Kelpies (who would probably break the longboats into mulch), and yet she tells them to fly and row/tow their boats over the water. This seems like a really really bad idea. I was honestly astonished that they all didn't just get massacred.

Scarab blinked in realization and swallowed. “Oh. Um. Her highness is with Captain Diamondshell and is in the…” The changeling coughed. “Seats of ease.”

Harlequin and Buzz blinked simultaneously, almost owlishly.

“Oh… Well that’s understandable. I suppose she wants to clear her head before the battle,” said Harlequin as if he was discussing the weather.

I would suggest maybe making it a little bit clearer what that means, or at least make it clear that they aren't literally... uh... with each other. Because I had no idea what a Seat of Ease was before I googled it, and based on the wording I came to a rather different conclusion as to what she and Diamondshell were doing.

But seriously, what in her highnesses flaming tits and shiny carapace was that?

Well, it's inventive, I'll give you that.

Also, either "highnesses" should be made singular possessive (highness's/highness') or "carapace" should be made plural.

@!%$#! that

Just swear like a normal person.

By the Traitor’s Sordid Heart

Who is the Traitor? Also maybe use a different adjective besides "Sordid", seeing as you used it previously to describe the Queen's Bedchambers.

Chrysalis didn’t know too much about engineering, but Alternia had been telling her about how the Hornblower had a double-bottom hull.

Wonderful, because the ponies/changelings really needed any more of their equipment rendered useless.

This meant the ship’s bottom had two watertight bottoms so that if one was penetrated, the other could hold water out.

Perhaps describe the appearance of the hull so it's clear what it is, instead of dropping a definition in there?

Buzz stepped back, his broadsword slapping the first strike out of the way. The kelpie was very persistent though, and attacked again, multiple tentacles from multiple angles, trying to wrap themselves around the changeling captain.

This just seems... odd. I mean, what is the kelpy going to do, not keep attacking?

he assumed the kelpies were even heavier especially since they had no holes in their legs to save weight.

Plus they're carapaces are apparently so thick and dense as to allow them to outright ignore basically everything that's been thrown at them thus far.

Problem was that the best way to fight a changeling was to out-maneuver them and flank them. In a corridor, he couldn’t do that.

If the best way to fight a changeling is to flank them, and in the corridor he can't do that, then that should be a good thing rather than a problem, right?

It was at this time that Buzz realized he’d been horribly mismatched by bad luck.

He knew what weapon he was wielding and he has to know, at least anecdotally, that kelpies are heavily armored. If he just realized now that he's horribly outmatched then it's a wonder he survived this long.

He overextended himself though. He slashed the first tentacle aside, but he hit too hard and left himself open.

In a flash, the kelpie seized the captain, wrapping its writhing limbs around him and pulling him up close. Buzz barely had time to groan and curse his own foolishness before the kelpie’s teeth broke through the carapace around his neck.

So he miscalculated badly, fought poorly, and died quickly. Kinda makes his sacrifice lean more towards suicidal than heroic, which is what I assume you were going for.

A wail of despair from where the main group had run convinced her and she galloped away, knowing she was leaving the remaining ponies and changelings to their deaths.

And from the sounds of things, they aren't going to be buying them much time either. They've already lost, what, 3 of the 8 that stayed behind?

“Prince Typhon of the Sea Ponies at your service, your majesty,” said the kelpie.

And who was apparently left floating next to an enemy vessel long enough for Chrysalis to fly over there, notice him, and capture him. He must be an absolute dick to his guards.

Chrysalis’s eyes widened. “An actual Leviathan?” She had heard of those mythical creatures on the sea, but always thought they were tall tales from crazy sailors.

Really? After everything that's happened, the fact that they have a leviathan, or any particular sea creature, is at all surprising? Reason to be afraid certainly, but surprising?

Typhon nodded nervously..

Either a period is missing, or (I think) more likely that was supposed to be a comma.

then that would mean they had a serious miscommunication problem.

Biggest understatement of both this story so far and the previous one.

As to the tsunami... that… was due to Empress Samudra’s death when she fought Tethys. When she died, all her power was released into the water, leading to the tsunami.

And at no point did they think that maybe they should help out the cities that their internal conflict devastated? Maybe send an apology? Communicate with them in any way? No?

No. Empress Samudra was my mother.

Calling it now, Samudra broke her oath of fidelity to Tethys.

how did she give birth to a kelpie?

Well, you see, when a kelpy and a seapony love each other very much...

We know of the Dark One who moves the moon, the White One who raises the sun, but I have never heard of an alicorn who is the sister of a changeling queen.

The kelpies at the very least know Celestia's and Luna's names, right?

The kelpies’ advance had been slowed substantially. The narrow confines of the corridor meant only two at most could be at the front and the hail of beams and crossbows fired had dogged their advance. The kelpies were still coming, though, a mark of how tough their carapaces were.

If you were ever looking for an opportune moment to give the Equestrians even the most minor of victories over the kelpies... that was it. They have quite literally every advantage they could possibly have right now and not only is it not enough, they are merely able to slow them down.

It’s preposterous! I mean if you are going to come up with a better excuse to explain why you’ve broken the agreement that we’ve upheld for a thousand years despite your constant violations-

Which they have apparently never approached Equestria or Griffonia about before now, despite how important oaths supposedly are to them.

Alternia could feel Typhon’s apprehensiveness and fear

Fear of what? He's the son of Samudra and a kelpy, given how they've steamrolled literally everything in their way so far, whether or not they'd even be able to kill him seems like a legitimate question.

Our kind has been preoccupied with internal matters for the last one thousand years.

I am... curious as to what kind of "internal matters" could prevent all or nearly all contact for a thousand years, especially of both the diplomatic kind and of the civilians-randomly-seeing-each-other-and-saying-hi kind.

As for why we didn’t send an envoy, you broke your word and ignored us. Why would we want to send an envoy then?

To ask why the hell Equestria ignored them. Or in more technological terms, they should have used TCP rather than UDP.

To think that the surface world completely forgot our existence is crazy, but it seems you have.

If I vanished into the ocean for a thousand years, I wouldn't expect anyone to remember me either.

I didn’t know that this was a big misunderstanding! We thought you purposely ignored us and violated our territory

This goes for the "miscommunication" bit too, but maybe use more... epic words? Weightier words? Something that would by its very meaning imply how serious it situation is, given they're at war and thousands have died?

“I wouldn’t do that if I were you,” remarked Typhon in a matter-of-fact voice. “My own guards are still present after all.”

And again, why was he afraid earlier? Were his guards wandering the ocean looking for him and just now realized where he was?

We have very good hearing

Because if there was anything I was thinking about the kelpies, it was that they needed another advantage over the Equestrians.

Captain Drizzt

Does he dual-wield scimitars?

---

And a couple of things to wrap up with:
1) I would suggest that you either drop the bi-weekly schedule or just wait to continue until your thesis/whatever other important things you have on your plate are done with. This reads more like a rough draft than a finished chapter.
2) Regardless of #1, just take a break and make a detailed list of every species, their abilities, and their justifications/explanations. That way people won't be able to poke a hole in them with 5 minutes of google searching, taking the originally stated reason for why kelpies have such heavily armored carapaces as an example.

Aaaand... that's it. I'm done. Onto more pleasant things.