What If King Sombra Won?

Author's notes this is my first story so if it turns out somewhat bad tell me what to fix constructive criticism is welcome.

Chapter 1: Total Corruption

Twilight and her friends are in the Crystal Empire attempting to defeat Sombra who is trying to take it over.. Twilight managed to get to the Crystal Heart only to be locked in a crystal prison on the top of the Crystal Tower but Spike managed to get the heart which fell next to him when Twilight said " don't move......... well move just not towards me." "You have to bring the heart to Cadence." Spike replied " but if i do you will fail Celestia's test." Twilight said " go..." Spike replied " bu-" only to be cut off by Twilight shouting " GO!!!" Spike, sweating grabbed the heart and fled to the window and stepped on to the crystal path that spiraled downwards to the balcony when he shouted " hey up here" Rarity then said " Spike?" Sombra then said "that heart is MINE!' He slammed into the ground using dark magic and headed to Spike who fell from the Crystal Tower and was falling to his doom. Shining Armor threw Cadence into the air to the Crystal heart even though she was suffering damage and recoil from the spell that she was using to spread love and light to keep Sombra out.. She caught Spike and the crystal heart and proceeded to the ground.

Cadence landed on the ground with Spike still her her back and put the heart into the "hub" where it will generate love and light. Suddenly Sombra fired a blast of magic which hit the hub and formed a dark crystal. the crystals spread to the Heart and corrupted it which turned the Crystal Ponies into Dark Crystal Ponies like Sombra. who shouted " Bow to your Dark Crystal Overload!!!" which without hesitation they bowed which created a dark aura around the city. The aura generated Dark Energy which launched from the top of the Crystal Tower made a "dark boom" which spread dark clouds all across the planet shrouding it in eternal shadow. Dark Crystals spread across the land corrupting everything it touched. Sombra used his dark magic to tun into pure shadow and traveled through the crystals.to Canterlot.. Where the Elements of Harmony are located. he was planing on corrupting the elements for world domination.