Originally posted on: September 24, 2018, 5:32 PM UTC

HC Tempest Shadow
'When my horn broke, I couldn't do the things I used to do''
King Tempus, Prince of destiny, Master of Thunder.
Did you knew that Tempest Shadow was supposed to be brother of Celestia and Luna? His name was Cosmo, and I liked that concept that much that I decided to make it canon in my Apoverse.
Storm king doesn't exist in this AU.
During first Friendship Festival, Tempus forces invasion of the city, wanting magic from the alicorns. Tempus turns his family into obsidian statues, Twilight and her friends escape.
He did it because he wanted to have normal horn, He thought it will make him look normal. Also he wanted to be more powerful than he actually was and he wanted his sisters to suffer.
Tempus tracks down Twilight to the desert city, after Mane Six escape him; then Calaeno's ship, RD did a mistake with sonic rainboom, they escaped him again. Tempus punishes Capper and Calaeno for their deception by destroying the airship on which they stand.
Tempus eventually captured Twilight on the Basalt Beach after her action in Seaquestria cause her friends to abandon her. In the airship he told her his backstory, that when he was playing with his siblings with spells in everfree forest, they went into Ursa Minor's cave, Bear woke up angry and hurted his eye and broke his horn because Tempus wanted to protect his siblings.
He couldn't understand why after the attack Luna and Sombra didn't look at him like they used to.
Friendship and Love has failed him.
He started to be more cold and blank after seeing his own destiny in his dream. He saw himself as a statue. He couldn't believe it. Tempus did everything to not make it true so he ranaway. He just wanted his own happiness. He runaway to find other creatures, to find his own place but whenever he went to, everybody looked at him like he was a freak. Like he was a monster.
He couldn't find himself.
After Tempus tried to drain princesses' magic, He let Twilight watch it, even if she wanted to stop him. She couldn't, she was too weak.
Meantime Rainbow Dash, FLuttershy, PP, AJ and Rarity with help of hippogryphs tried to find Twi, to help her with Tempus. They were in coronation room, Tempus laughed at these little ponies, he knew they couldn't do anything to him. He was wrong. Their harmony magic changed him into stone.
And Twilight knew it was for Equestria's good, but it felt wrong.
They turn back to normal Three princesses, two of them seems to know something that others didn't knew.
It ends with Songbird Serenade song and everyone is celebrating victory.
Then after a week Twilight ask Celestia about Tempus.
She doesn't say anything special about it. She says she knows him, but doesn't say who he was.
More:
- Tempus is still a stone figure in Celestia's garden, She often goes there to think about how she can make him more friendly, how without Twilight's help she can undo her mistakes. By the way, Celestia erased Luna's memories about him because Luna was a weak pony she thought that will be better for her sister.
- Celestia, Cosmo, Sombra and Luna are siblings. Each of them tried their best in every place in Equestria but since Cellie is oldest one, she is the most popular sibling who took the title 'Ruler of Equestria'. Cellie tried in 'Heart of Equestria' - Canterlot, Sombra tried in Crystal Empire (and failed as we know), Luna gave up and ruled in ponies' dreams and Cosmo. Cosmo after incident * tried to find his place, he tried really bad but nopony accepted him 'cause of his personality and his look
- His daughter is Cadence. His wife was Amore. Sombra turned her into stone, because of jelaousy. *Please ** remember that the timelines are other in my AU, he wasn't a colt when he met Amore. It was 'young adult' love, it seems hurtless to anyone but turned to 'something' that nobody expected. Also, Tempus don't know that he have a daughter.
- About him and Grubber, at first he thought of him as a sidekick, later he was brave enough to call him a 'colleague'.
- His real name is Cosmo but he didn't liked it that much. He often told ma that she made mistake naming him like this. Tempus didn't told anyone about this. He prefers his nickname, he named himself like this because he didn't forget about what Sommy and Lulu did when they were young.
- He used to be the best in hoofball.
- In his childhood his nickname was Mr. serious.
- No. His name isn't Fizzlepop Berrytwist.
Welp, First headcanon about MLP character, I'm not that proud because my english is pretty bad,,, I'll try to make it better within time, it's not my first language.