Twilight Sparkle: At least we made it ahead of the changelings, right?
DM: Weeelllllllll...
Twilight Sparkle: Oh drat, now I'M the one who spoke too soon!
Rarity: Happens to the best of us, dear.
DM: There are... a few changelings in the tower already.
Applejack: How much is "a few?"
DM: A few... dozen. Or so.
Pinkie Pie: Buh-wuh??
DM: There are thousands of changelings storming the city. The vault is safe, of course, but the hall outside is occupied.
Rainbow Dash: Darn it! I *knew* I should've flown on ahead. I'm probably faster than all these chumps!
Twilight Sparkle: But what about the spell to unlock the vault?
Rainbow Dash: Well... why'd we put the Elements in a place only a slow unicorn can reach?!
Twilight Sparkle: I'll keep that in mind for next time.
Fluttershy: If there is a next time...
The connected pan shot there in those last two panels makes for a genuinely intimidating tableau. It was hard to arrange the text in a way that doesn't completely destroy the effect, but I saved a textless version anyway.
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I want to know if the DM had a prepared visual so the players can see exactly how many changelings were waiting in the hall for them. That is, if the players actually saw the last two panels, or if they were just imagining it from the DM's understated description.
Going by the textless version I count at least 49, assuming no overlap between the panels. "A few dozen" might be merely 24 or 36, which seems similar to the quantity the PCs just handled.
And then the changeling give was defeated, reformed, and became everyone's OC! The end! ...ok, maybe not, but I sure remember when this episode aired the first time and then there was a huge influx of Drizzit-style changeling OCs . :3
I mean, one of the better semi-"Drizzit-style" things to come out of everyone and their cousin making changeling OCs, was a few people deciding that there was more hive clusters out there in some fashion (either similar love-eaters under different queens, or entirely different styles of emovores with a different primary color theme) that took offence to Chrysalis' actions in basically blowing their cover in the area.
As one of those 'everybody and their cousin' individuals, I have to ask... wouldn't you take offense? Changelings are suited to hiding. Chrysalis not only blew their cover, she did so in a way that was likely to kill any potential love harvesting going forward, even if she won. They are not only known, they are a known threat. Thorax may have been able to deflect that eventually, but in the immediate aftermath...
How so? She would have been in charge, but nopony would give any love to the changelings, because all the emotions the ponies would have towards them is fear, hatred, etc. (As seen in Thorax's debut). Sure, they could have kept disguising themselves as ponies' loved ones to steal love, but they didn't need to take over Equestria to do that. If anything, doing so would make ponies paranoid and reluctant to love/trust others, making it harder for them to feed. (As seen in To Where and Back Again, when Starlight confirms Trixie & Thorax's identities before trusting them).
That's why Chrysalis's plan (take over Equestria) and stated motive (provide food for her subjects) never made sense to me or many other Bronies. They just don't line up. It seems like the whole Canterlot wedding plot was just a mad grab at power for Chryssie.
My headcanon about it was that the plan was for the invasion to fail, at least that's what it would look like.
At the last moment, the guard starts to rally and things snowball as they rescue more of their comrades.
The changelings are routed in the streets and the princesses revers things in the palace.
But, tragedy! the princesses are badly injured. They'll recover but it will take some time and there will be minimal direct contact with them for years.
So a regent is appointed who will handle the day-to day.
A regent who is really Queen Chrysalis, and the guards that rallied and swept the changelings from the city were just more changelings in disguise.
Much of the governing structure is quickly replaced, with a special focus on the education system.
In a generation, everyone knows how the invasion was stopped due to some changelings turning against the queen.
Another generation, and everyone knows that it was Chrysalis leading her loyalists against a general who seized power.
Another and the whole thing was a disgruntled minority of changelings.
Another and changelings have always been part of Equestrian society, although there was that small group of coup plotters a century or two ago....
Another and history talks about how Chrysalis was alongside Celestia in welcoming Luna back into the triarchy.
Then everyone knows Chrysalis is the senior ruler in the triarchy, (after all, she's the queen).
And finally, every pony grows up hoping to join Celestia and Luna as the personal slaves of the queen.