Ah, so Discord's existence/magic prevented sentient life outside from the planet to find Equis and this machine from sending a signal to its builders?

Well Emerald, you've gone and fucked up. Maybe Luna and Celestia knew about it and that's one reason why they never wanted to harm Discord in this universe.

But I really hope that you'll show Celestia's and the bearers' reaction to what happened, but mostly Celestia's. She wanted to "reform" him into an ally and this plan completely failed now that he's dead. I find it hilarious how Celestia's plans just go out of the window with Emerald's interventions time after time. I wonder if Twilight Alicorn is still a possible thing, because the castle is already out of the question without Discord's reformation during the season 4 finale what would give them the last key.

That chapter was a very unexpected twist.

Now that I think about it, Discord's Plunder Seeds maybe just died now as well, because their creator is dead. So the Tree of Harmony will never be in danger. And THAT would mean... no magical box anyway.

8383369
Well, as far as Emerald screwing up, maybe. But her paranoia of a planet being attacked has led to her setting up contingencies. This like Orbital Defense Platforms and a ship yard located on the same island she was going to be training the Equestrian SPARTANs at for building her heavy cruisers. Things will come to a head in the next chapter. Things like Twilight's Ascension and the magic tree castle in a box will still happen, but Twilight's key will be different than it was.

8383369
She did warn celestia shit would go down and he inflicted pain on twilight.... the technology might be this dimensions humans because that robot sounded way to stargate sg-1 but humans are suppossed to be extinct....tirek only got strong enough to stand toe to toe with the alicorns due to discord letting him drain ponies. Emerald who has the same chaos magic or other technology to track him would crush tirek on sight. I think that emeralds fiendfire could clear out the roots strangling the tree of harmony. Truthfully I'd see her getting a key from sunset shimmer way before discord anyway she literally taught her friendship and i don't see emerald letting her be abandoned like in the movie I mean come on twilight banished her to earth no letting her try to fix things with celestia no nothing yah she made friends ....eventually with the equestria girls but we know she would've had an easier time befriending equestria main 6.

8383460
I think it was explained why Sunset never returned because she wasn't ready to make amends with Celestia because she felt she didn't deserve it because of what she had done. But you can bet Emerald will be poking her head in to check on her to make sure she is doing alright from time to time. Also, as far as humans being extinct, this is a completely different reality than the one that Emerald is from, so there are no guarantees on them being extinct.

8383559
Oh no i agree with you on the humans that's why I said this dimensions humans.... as for eq girls it all comes down to how you interpret twilight speech about stopping sunset from conquering equestria yadah yadah but in the end I personally feel she got abandoned she'd of had an easier time befriending her pony friends if she wanted to teach her about friendship and it's not like twilight really gave celestia any real info about what happened or celestia woulda been thorough the gate 5 seconds later apologizing with hugs and kisses for how she treated sunset.

8383592
This is very true. But I doubt that Sunset would have been able to develop and learn the lessons she has if she went back to Equestria. The absence of magic at her beck and call also helped. She had to learn to rely on people.