I flew to the castle and went in through the window to see a a dark hole in the floor. "Huh, I was gone longer than I thought" I said. I hurried down into the chamber where I found Spike with Twilight sitting in front of a door. "C'mon Twilight wake up" said Spike. I cleared my throat to get his attention. "Huh, Mamoru, I'm so glad you're here, cool arm by the way, something's wrong with Twilight" he said worried. I waved my hand in front of her face, "Yup, she aint home" I said. "What's wrong with her" he asked.
I looked at the door, then at Twilight. I closed the door. She shook her head. I looked at the door. "Mamoru what are you doing down here?" Asked Twilight. "Enjoying the show" I said as I looked to the crystal above the door. I raised my good arm and thought happy thoughts and sent a Rainbow beam at the crystal. The door opened revealing a staircase. "Let's go, Sombra is on his way and he isn't happy!" I said running up the stairs.
Eventually Twilight and Spike caught up. I stopped. "This is taking forever" I said. Then me and Twilight looked at each other with a knowing smile. "Gravity spell!" Me and Twilight said together.
I grabbed Twilight and when we cast the spell we went from walking on steps to sliding up the bottom of them. "I studied gravity spells in case it would by in my test, I'm glad I did" Said Twilight. "I spent most of my time here reading books and scrolls, and I've memorized each spell and potion I read about, I'm not sure if you knew, but I have an almost photographic memory, almost meaning my short term sometimes causes me to be a little forgetful, but long term is great, and this is awesome, I've never slid up the bottom of stairs before!" I said. My soles sparked as we made it all the way to the top, once we did, we canceled the spell and our gravity was back to normal. There in the middle of the room was the crystal heart. Twilight went for it. "Wait" I cried, but it was too late, dark crystal shot up from the ground and trapped Twilight inside. The Crystal heart slid to me and Spike. "Twilight, we have to get the Crystal heart to Cadence, NOW, it doesn't matter who brings it, it never mattered, Spike get the heart and grab on, we'll be back for you Twilight" I said with haste. I took my prosthetic arm off and tossed it to Twilight. "After this I won't need that, but I might need it again so hold onto it" I said while picking up Spike with the crystal heart. I ran to the edge and jumped.
I saw Cadence being launched by Shining Armor and sombra coming for us. "Spike take this to Cadence, I have a score to settle" I said giving him to Cadence as she flew past. Sombra was about to go after them but I sent out a shockwave to push him back. I shot after him and gave him the strongest and most epic and devastating uppercut of all time, just as the crystal heart was put back to where it truly belongs. There was a wave of love that vanquished Sombra, and flowed all over Equestria. I watched as his horn sailed off, Only to be seen again in season 9. It made everypony in the Crystal Empire sparkle and shine even me, it also got rid of the crystals in Shining's horn and my arm, causing it to comically pop out of my sleeve.
I was able to make a controlled fall towards the ground. I looked myself over, I was covered from head to toe in.... magic that made me shine I guess. I used my super speed to run back to get Twilight. I ran up the side of the castle and made it to the top I stopped as soon as I got there. "Hey Twilight, I like the crystal look, I fancy it myself, lets say we get out of here" I said. I grabbed Twilight bride style, and ran down the side of the castle and ran to the base of the castle and I met up with Everypony. I put Twilight down and looked around, everything is as it should be.
"We did it, alright!" I said throwing my fists into the air. All the crystal ponies cheered for me and Spike. "I could get used to this" I said smiling.
"Time to celebrate" I said pulling out my phone and selecting one of my favorite songs and using my magic to send the sound into the castle, causing it to vibrate and amplify the music so it could be heard by everypony in the Empire.
---Music starts---
https://m.youtube.com/watch?v=AkLM7CJEeBg
---later back in Canterlot---
"Well, Twilight, how'd it go" I asked. Me, Spike, and the girls gathered around Twilight. "I passed" said Twilight smiling. Everypony congratulated Twilight, then as we all finished, I flew into the sky and spun around with my arms out, sending fireworks into the sky. Then I blasted off towards Ponyville.
"You didn't really think I'd stick around for their little song did you?" I said with a grin.
---later at Twilight's library---
I was there in the library in my pony form I left my clothes in the laundry and had my weapons on my nightstand, I liked to leave my horseshoes on so I wasn't completely unarmed, I had magic, but that doesn't mean I shouldn't have a backup plan in case my magic doesn't work. So I just looked like any other pony stallion. I was reading a book when Twilight and Spike got back home, Spike was sleeping on Twilight's back. "Hey Twilight, you have fun?" I said putting my book away. "Yes I did, Shadow Star, why didn't you sing with us?" She asked. "You and your friends have sing alongs almost every day" I said "I wouldn't say" she started before I interrupted her by pulling out my phone and playing just about every song she and her friends had sung up until a couple hours ago. Wait where was I keeping my phone?
"You were saying" I said with a smirk. Twilight blushed. "Ok you have a point" admitted Twilight. "Lets get to bed, I'm beat" I said getting up and heading to my room. "Good night" said Twilight. "Good night" I said back. I went over to my bed, got comfortable, and went to sleep.