MLP: Believing in the Impossible - Chapter Eleven
"just as i needed the goldfeathers to unite their clans in an effort to free the crystal empire from the grasp of corrupted king sombra."
Nightmare, Nightmare Chapter 6
The crystal heart blew king sombra into oblivion; who's to say it couldn't do the same to her? even if it couldn't, cadance could have led the entire kingdom in rebellion as soon as she or somepony figured out a way to move the sun and moon.
Chapter Nineteen: The Summit Begins
Thankfully, king sombra remains sealed and is not a matter we need address today.
story: Friendship Means Responsibility (My Little Pony)
Even king sombra had sworn an unbreakable oath not to use such a virus as a weapon in any war.
Nightmare, Nightmare Chapter 5
Press really went below the belt when she compared tyrant armor to king sombra. that off course brought cadance quickly to her husband's defense. velvet interfered and dismissed cadance's words.
Eiserne Nacht Part 1
Equipped with her modern weaponry, we stand a much better chance against celestia and equestria." she gently moves around "i can hardly wait to see your new panther tank." she rubs her chin with her hoof "and speaking of allies, how is our friendship with king sombra
Rising Effort - Prologue: Stars & Embers
king sombra let out an exasperated sigh, still quite unconvinced.
MLP: Believing in the Impossible - Chapter Seven
Knowing just how much of a loss it was that formerly gallant ra - a warrior who's family's legacy dated back to the age of helping the immortal alicorn sisters defeat king sombra - couldn't have been saved from descending into his greedy, treasure hoarding
MLP: Believing in the Impossible - Chapter Six
Much like when she had suppressed nightmare moon to bring back luna, when she had reformed discord, when she had ruined queen chrysalis's invasion plans and foiled king sombra's tyrannical return, when she had altered her friend's very identities as well as
MLP: Believing in the Impossible - Chapter Four
Considering the history she's had with your master - how he allowed the fall of her parents, the banishment of an entire civilization, the making of everfree forest, king sombra's reign, her sister turning into nightmare moon, me being freed to be reformed