Very good i already like it now write more chaps of this and discords rewrite and ill be happy

Keep up the good work. I admit that I am not the biggest Overlord fan but I found translations of the novels on my tablet and am reading them during down times at work.

However, I wish there was art of what each of the extended characters look like. I'm trying to figure out how far along the anthro scale they are and my imagination is having trouble.

hmmm can the equestrians also mate with the inhabitants of this world or just themselves?

"Not mutually exclusive things, unfortunately," Discord corrected solemnly.

Indeed

Enri held desperately onto her sister, her wounded back exposed to the knights standing sinisterly over her with their weapons poised. If only for a few seconds, she'd keep Nemu alive and try to give her a chance to run and escape into the forest.

WOHOO best general Enri has enterd the stage

Discord hummed as he stood back up as he looked down the path to the village. "My name is Droc," he answered simply, ignoring the odd looks the Alicorn sisters gave him.

Okay, why the different name... actually why did he call Celestia "Sun" ?

Great story so far
Also easy to solve the population problem.
One giant orgy.
Get some draconequuses going ~

9282449
I am sure Lyra will be doing a extensive study on this once she realizes that this new world has human's , but all joking aside i would take a guess that they would be able to have children with at least a good number of the Demihuman Beastmen races of the New World, and in general fantasy Human's are known to be able to children with various races that in all truth they have not business reproducing with in the fist place (Dragon's, Elemental's, Vampires, etc) so i am going to say yes for them as well, and as for the more monster races (can't remember how to spell what the show call's them) i am rather unsure but am guessing that it matters on the monster type.
(then again i do remember there being a half-golem)

Well this was a interesting chapter, there are a few things i wanted to note. . .

Discord sorely hoped there were elves in this world, because was vaguely sure the Kirin were their Equestrian equivalent.

Personally i always thought of the Deer from the comics as Elves, i would see Kirin as the pony equlvent to Dragonewt/Dragonborn

"Canterlot was built to hold a population of three-hundred thousand, but ideally only two-hundred thousand. Prior to the Exodus, Canterlot had about one-hundred one-thousand five hundred living in it. Of those: sixty-five thousand were unicorns, twenty-five thousand were pegasi, ten thousand were earth ponies and the remaining one-and-a-half thousand were of various other races,"
"After some squeezing and setting up camps outside the city, we managed to get a migration population of nearly three-hundred thirty-five thousand in Canterlot,"
"The Exodus count is as follows: Three-Hundred Young Dragons and Eggs."
"Two-thousand Yaks," .
" All one-thousand of the Kirins and all ten-thousand Changelings"
"Twelve-thousand Hippogriffs/Hippocampus came. Queen Novo also sent her entire royal guard and their families."
"With us came seven-thousand batponies and most of the now-twenty-thousand griffons."
"Four-hundred centaur, three-hundred gargoyles and fifty cyclopes," he counted off from memory.
"five-thousand Diamond Dogs of various packs from all over and beyond Equestria, one-thousand five hundred Minotaurs and two-thousand Phoenixes," Celestia finished.
"Unless my memory is wrong, there were also about twelve-thousand miscellaneous creatures," Thorax noted idly. "Donkeys, deer, moose, caribous, perytons, abyssians, ornithians, zebras."
total of new ponies to fifty-thousand Unicorns, fifty-five-thousand pegasi, fifty-five-thousand Earth Ponies,"

Okay so this gives us the number's of the various races that where brought with them, in truth i am surprised that any of the Deer came with them seeing how in the comics they are super obsessed with the Tree's, i would of thought that they would of stayed to try and save them.

I am also really happy for this since it both address my questions for the last chapter, and because it uses the comics, though i do wonder how many "Big" players ended up going, on this "migration" i mean we know about the Mane Six and the various ruler's that have made the journey (and that Daring Do and Ahuizotl chose to stay behind) though i do wonder about the likes of the Pillar's of Equestia, various Ex-villain's, and Chrysalis (i can guess those trapped on earth or tartarus where left there).
Though i am a bit surprised by the mention of Phoenixes since i always thought of them as a non-sapient race like Manticore's or Cockatrice, huh i wonder if that means any other creatures where saved during this endeavor, i doubt many but i still wonder.

"The Crystal Empire is fine," Discord answered bluntly, causing sighs of relief all around the table.

"Do you know where it is then?" Ember asked sternly, trying not to sound hopeful.

"I know this'll sound weird, but it hasn't arrived yet," Discord stated vaguely.

"It hasn't? Is that bad?" Skystar asked in worry.

"No," Discord assured with a head shake. "In cosmic terms, we arrived at the same time, but that doesn't mean the same planetary time. A cosmic "instant" can be anything between a second and a year. So, it'll appear sometime in the future. Ponyville, is more of gamble, I'll admit."

Interesting, so this conforms the survive of the Crystal Empire, and along with it the Crystal Ponies (and maybe the Shadow Ponies), though it seems that Ponyville's surival is still up in the air. . . i wonder if this means that the Great tomb of nazarick can still have a chance to pop up. . .
(and i just remembered to finish reading that overlord/gate crossover i was reading)

"Besides, the population ratios are a smaller issue thanks to a little tweak you were all given."

"Tweak, Discord?" Thorax inquired with a head tilt, his pure purple eyes betraying nothing.

Discord nodded before smiling impishly. "Harmony and I made sure every species can safely interbreed with one another," he pointed out. Everyone looked taken back by this. Interbreeding wasn't impossible, but it didn't always take and the health of the potential offspring was a concern. "It might result in more subspecies, but most children will be one creature or the other," Discord added on, waving off the obvious questions in their mind.

Huh, i then i wonder where the Hippogriffs and Kirins came from, i always thought hey where the result of Interbreeding between Ponies and other races, kind of like how Human's in most general fiction tend to interbreed with a number of creatures they really shouldn't be able too.

"AAAAHHHHH!" Skystar screamed in terror at the sudden image of a bipedal creature, clad from head to toe in steel armor, swinging a sword as sanguine liquid sprayed through the air.
Seaspray held Skystar to comfort and assure her, but he was just as transfixed as the rest of the room stared with wide eyes as the...soldier cut down what most assumed was a human, who fell to the ground dead. The view turned, seeing that it was not just a lone incident: dozens of identically armored beings were striking down every human in sight: females, males, young, elderly. It was an indiscriminate spilling of blood, against those without weapons or protection.

"Those...humans slaughter each other so ready?" Luna questioned with a scowl as she balled her fist.

While this is not ideal for them i do have to admit that they really could of gotten much worse then this world, even with the violence seen here its still nothing compared to a Dark fantasy world like Ravenloft, Athas (Dark Sun), Chronicles of Darkness, Aryth (Midnight), or the worlds of Berserk, Claymore, Goblin Slayer, Re:Zero, Ubel Blatt, Dark Souls, The Witcher, Drakenguard, or even Game of Thrones.
That said i do see the New World as normally a Dark fantasy world, just one from the preservative of the unstoppable evil overlord trying to conquer it and his nightmareish army of monster's.

On the other-hand they are lucky they didn't land in the Ponyfinder universe since (other then being connected to Pathfinder and DnD universes) the phyocilogical issues of finding a world where Ponies can be just as violent and evil as any other race. . .
Though i can hardly wait until they run into concepts of creatures like undead and demon's and man eating slime's.

*ZWRRRRLL!*

He did look a bit impressed when a yellow beam roared by, evaporating the armored man from the waist up. The cauterized lower half fell back with a thump, to Enri's disbelief and growing fear.

"That was overkill, Sun," Discord mused as he looked to the new arrivals.

And thus the integration into the plot-line of overlord begin's.
But yeah that was overkill, that said i do hope to see more battle magic in the future.

I wonder were spike is?

Hmh. Looks like a good story so far. Will Ainz Ouwl Gown get involved I wonder?