While the set up is simplistic and looks placed like a theater stage, I do love your use of detail and color here. And of course gets of the ponies corrupted and Twilight can only look in horror. It looks like Discord is SHOWING TWILIGHT how easily corruptible her friends are. And Rainbow Dash looks like she's SAD she's HAD TO betray her friends to save her own kind.
I do note it as strange that Twilight has her horn here, making it after the game, but Rarity and Fluttershy are missing their wings and horn.
Thanks for drawing this.
I chose to write my own POVs on what's going on these ponies brains as darkness takes them and after. Complete with bonus chapter and epilogue! (Shameless self promotion done.)