Sombra shot forward, one of the black crystals in his magic being wielded like a sword. Twilight set up a barrier blocking the strike, only for Sombra to swing again, destroying the barrier. As he did so, Glacier spewed flames at the king causing him to jump away. Arctic flew up to Sombra and grabbed him by the horn. Spinning around rapidly, Arctic threw Sombra away from the castle.
Everyone gave chase, ready to keep up their attack. As they got closer, black crystals shot from the ground and rapidly approached the group. They all scattered and dodged trying not to be struck by the crystals. Rarity, tapping into her magic, began her attack. The gems that made up her cutie mark, appeared on the ground Sombra and blue gems shot out, slicing up Sombra.
Twilight, Tundra, and Arctic all surrounded Sombra and fired blasts at him. Before they could hit, Sombra summoned more black crystals making them protect him from the incoming blasts. After the blasts hit, Sombra emerged from the crystals and charged towards Twilight, his crystal sword at the ready. As he started to slash at Twilight, she teleported away. Winter and Rainbow Dash, who had been flying over head, nodded to each other. They both began to fly down, back to back, with a hind leg outstretched. Before Sombra could do anything, the two slammed into his back knocking him to the ground.
After Sombra shakily began to stand, he got punched in the stomach by Arctic and kicked away into Pinkie’s Party Cannon, which blasted him and sprayed confetti all over the place. Sombra swung his crystal sword at Pinkie, but her Pinkie Sense told her about the incoming attack and she was able to dodge and scurry away. Applejack, with her lasso at the ready, lassoed Sombra and yanked the rope back, sending him flying towards her. Swiftly turning around, Applejack bucked Sombra in the stomach. However, Sombra was able to ready his sword and cut Applejack’s back leaving a huge gash. After Sombra collapsed next to Applejack, he got back at Applejack by bucking her, sending her skidding across the ground. Rarity rushed over to Applejack to help her.
“Are you alright darling?” Rarity asked as she helped Applejack up.
“Ah’m fine Sugarcube.” Applejack said. Though she was sure that she would need to get her new wound checked out.
Back in the fight, Sombra was going against Glacier. The dragon was shotting fire at the king, trying to hit him, but he always seemed to find a way to dodge. So, Glacier decided to fly up to Sombra and slash at him with his claws. While Sombra was able to dodge some of Glacier’s slashes, he had been hit by a few. With his anger growing, Sombra swung his crystal sword at Glacier, but he was able to dodge. Landing on his claws, Glacier swung his tail at Sombra, hitting him across the face. Using his magic, Sombra grabbed hold of Glacier’s tail and slammed him into the ground before bucking him away.
Arctic, having managed to sneak up on Sombra, grabbed onto him and suplexed him before grabbing his hoof and throwing him into the air. Rainbow, having noticed the airborne king, flew towards him and rapidly threw punch after punch, hitting him in the gut. Sombra, used his magic to grab Rainbow and kicked her in the face before falling back to the ground with Rainbow still in his magical grasp. And after landing on the ground he slammed Rainbow to the ground.
After landing Twilight had begun firing blasts at Sombra. Noticing this, he began firing blasts back. Each blast they shot collided and giving off multiple explosions. Winter, flying up behind him, charged up magic within her wings and fired to massive balls of magic at Sombra which struck him leaving a massive explosion in its wake. After the smoke clears, Sombra is there, covered in bruises, some blood, and bleeding heavily.
“Hehe. I must say, you all are exceptionally well fighters. You managed to get in some decent hits. Although, I won’t be losing to either of you.” Sombra said a wry smile.
Just then, multiple black crystals emerged from the ground and began to cover him. More and more crystals appeared and before they all knew it, a giant crystal pony had formed with Sombra sitting in the forehead.
“I don’t like the feel of this.” Arctic said.
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Princess Cadence and the three ponies with her were traversing the stairs making their way to the top of the tower of the castle. One of the ponies, having noticed something out of the corner of her eye, looked down, only to see a giant crystal pony fighting with the Element Bearers and the Quartet.
“Oh my goodness!” The mare blurted out.
All the others looked to the her and then to where she was looking.
“Oh no!” Cadence exclaimed.
“Do you think they can beat that thing?” A stallion asked.
“I trust that they’ll be able to hold it off. Once we get the crystal heart we can be done with this. And hopefully the elements won’t need to be used.” Cadence said as she began climbing the stairs again.
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Arctic, Glacier, Winter, and Rainbow were all flying above the giant crystal Sombra throwing punches and kicks trying to break the crystals. Applejack was bucking at the crystal Sombra trying to break it, with Pinkie blasting it with her party cannon only really covering it in confetti.
Twilight and Tundra were firing magical blasts at the giant Crystal Sombra but their blasts weren’t doing much, not even Rarity’s Gem Storm Attack was doing much.
“What the hay?!” Rainbow shouted. “Why can’t we break this thing?” She said as she dodged one of Sombra’s swipes of his tail.
“There must be a way to break it.” Twilight said as she dodge Sombra’s hoof as it stomped into the ground.
Arctic was thinking up any way to try breaking through the crystals.
“Maybe I could use that form again.” Arctic said.
“Well, it could work. Give it a shot.” Glacier said.
Arctic flew away from them and landed on the ground. After struggling a bit, he was able to tap into that form again.
After taping into it, he flew towards the Crystal Sombra and threw bunch at it managing to punch away a massive chunk of crystal away. With a smile, Arctic began rapidly flying around the Crystal Sombra, punching and blasting away at it.
Sombra was doing what he could to attack back, managing to get a few good hits in but Arctic managed to bounce back and keep up his assault.
==========*********===========
After reaching the top of the tower, the group spotted the crystal heart.
“There it is. Let’s get it.” A mare said, as she shot towards it.
However , once she got close, she stepped on an alarm. Sombra having been alerted, activated his magic and trapped the mare, but not before she managed to knock the Crystal heart away.
“Are you okay?” Cadence asked as she ran up to the Crystals keeping the mare trapped.
“I’m okay Princess.” The mare said.
“That’s good. Now let’s get the Crystal Heart back.” Cadence said as she picked up the crystal heart with her magic and began to leave the tower.
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Sombra, having been alerted to the fact that somepony was near the Crystal Heart, he was keeping a close eye on the tower. Just then he saw Princess Cadence exiting the tower. In a bout of rage, Sombra stomped on Arctic slamming him into the ground, before rushing towards the tower.
“You won’t win!” Sombra shouted as he ran faster sending Crystals shooting through the ground trying to stop the Princess. She managed to dodge a crystals but was taken aback when Sombra got on his hind legs ready to slam Cadence into the side of the castle with his forehooves. Before he could hit her, his hooves were grabbed. It was Arctic now in his Oozaru form.
The fight had gone on for a while. The sun had set and the moon was out. After being slammed into the ground, the mane 6 and his siblings rushed up to him.
“Arctic!” Glacier shouted, “are you okay?!”
Coughing up some blood, Arctic responded.
“I’m fine.”
“Fine!? Darling, you were just crushed under that giant brutes hoof!” Rarity said.
“And to make things worse, he’s going after Cadence.” Twilight said, fear and worry in her voice.
“I think I have an idea to keep him busy.” Arctic said looking to the moon.
“What idea is that?” Tundra asked.
When they got no response and saw Arctic’s eye were red and his chest was thumping his heart beat heard by all of them, Winter perked up.
“We need to get away!”
“What for?” Rainbow asked.
“I can’t explain now, but we need to leave.” Winter said.
They all ran, getting away from Arctic as he began to transform.
After being grabbed by Arctic, Sombra began fighting Arctic again as Princess Cadence flew away, dodging any falling debris caused by the two giant’s fighting. After managing to get away, she flew under the Castle placing the Crystal heart in its proper place. The snowflake pattern in the center began to glow and after a concentrated burst of magic the Crystal Heart began to destroy the black crystals and the crystals surrounding Sombra before destroying his physical form. The Crystal Heart also began to repair the damage and everypony became crystal even Glacier and Arctic. After everything was over, Arctic began to fall out of his Oozaru form and checked out his body.
“They did it!” One of the Crystal Ponies shouted.
“That was intense. I’m much too old for this.” Said an older Crystal Pony.
Princess Cadence walked up to the Crystal Ponies who had been under Sombra’s control. They were dazed and looked up to the Princess.
“It’s finally over. Get some rest now my little ponies.”
The ponies smiled and nodded. After shakily getting up, they bowed and walked away to get some rest.
===========*********==========
Out in a field the Solar Guard were fighting it out with Sombra’s ponies before suddenly collapsed. Sombra’s magic before leaving their bodies as the Solar Guard stopped in their tracks.
“It seems Sombra has been beaten.”came a voice.
“Should we head back home, dear sister.” Asked another voice.
“Yes. We should get our injured ponies tended to wait to hear from Cadence.”
After getting their things gathered, Princess Celestia and Princess Luna began to head back to Canterlot to get things in order.