Lost blades of Equestria (REWRITE)
My name is Shadow, a Filipino and Assassin by blood. I was in my car with my friends Jack (a British Assassin-turned-Templar) and Charm (an American innocent) and we were heading to a convention dedicated to fostering peace between us Assassins and Templars. Being in cosplay and (unloaded) weapons are allowed inside the Con, so I was in my Assassin robes while Jack was in his Templar uniform. Charm was is a Knight costume and all our weapons were in a duffle bag at the back of the car. I showed the parking attendant that I was an assassin and he let me park for free.
"You assassins are so lucky to have such privileges." Jack said as I turned off the car.
"Yes, yes we are." I said as we exited. We were about to enter when we realized that nobody got the weapons, I ran back and found the duffle bag was missing.
"Well, means we have to buy new stuff." Jack said when I came back empty handed.
"I've just got a hundred bucks on me." Charm said sadly.
"I carry half a thousand on me at all times so I'm good when it comes to cash." I said as I checked my wallet.
"I brought four hundred dollars with me." Jack said. "So we have a thousand bucks between each of us."
"Lets see if there's anything good here." Charm said as we entered. We walked around until we came across the merchant from the Resident Evil franchise. He looked at me and Jack and mumbled something under his breath.
"Hey merchant, is there a universe in trouble again?" I asked as I approached, he began to shake when I got close.
"You goddamn assassins and templars always find me, but to answer your question, yes there is." He answered.
"If you can hook us up with some gear we would happily save that universe." Jack said. "We're pretty bored now we can't kill each other."
"Sure, what do you need?" He asked, I bought myself a G36 (C variant), a short-sword, and a set of titanium hidden blades, Jack got a M468 and Saber, and Charm chose to get a broadsword and a shield. We paid eight hundred but gave the remaining two hundred as a tip for him after he gave us infinite ammo and indestructible weapons.
"By the way, you'll be sent to..." was the last thing I heard before I blacked out.
I woke up in a forest with my G36 on the ground by my side and my Glock in my holster. I stood up, picked up my rifle, and chambered a round before I set off in search for whatever is causing this world's unbalance. I walked around for a few hours without incident until I found Jack.
"Have you seen Charm?" I asked as I showed myself.
"Jesus Christ Shadow! You scared me half to death!" He shouted.
"Sorry, surprising someone is second nature to an assassin such as myself." I said.
"You surprised him? Dang...I wanted to see that." I heard Charm say as she showed herself from my right (Jack's left) and sheathed her broadsword.
"How long have you been standing there?" Jack asked.
"Long enough to hear what happened." She said which got a glare from Jack.
"We're here to save the world, not talk about jump scares." I said when we heard something from behind me. "There's a monster behind me, isn't there?"
"Yup." Was all Jack and Charm said before I turned and fired a burst from my G36 at the creature. The creature roared in pain as the burst connected with its face and I rolled under a claw before firing another burst.
Meanwhile, Jack fired his M468 on full auto whenever he had a clear shot and Charm charged with her broadsword and fought like she was from Dark Souls. Ducking and dodging while swinging her blade whenever she could. We quickly brought the beast down and I discovered it was a Manticore. I went over to its remains and began the traditional ritual for the dead.
"Requiescat in pace my worthy foe, may we meet again in hell." I whispered to the body.
"Can you hurry up? We don't have the time to wait for you to finish you ritual." Jack asked.
"Fine, I'm finished anyway." I said with a groan.
"SOMEPONY HELP!" Shouted a familiar voice.
"Somebody's in trouble, let's go!" Charm said as she ran towards the cries for help.
"Goddammit!" Me and Jack shouted when we saw who was in trouble, it was an ANTHRO Twilight Sparkle from my little pony being attacked by Timberwolves! She was in a green T-shirt and jeans
"Help me!" Cried Twilight as she put up a magic shield. We attacked the Timberwolves and killed them with ease.
"Thank you, wait...your not ponies! What in Equestria are you?!" She shouted as I she saw our faces.
"What? You've never seen a human before?" Jack asked as he slung his rifle over his shoulder.
"H-human?! Y-your s-supposed t-to b-be myths!" She stuttered in fear as she slowly backed away before teleporting.
"Well, that went well." Charm said sarcastically. Since we knew we were in My Little Pony, we easily navigated what we assumed was the everfree forest and arrived at ponyville at around noon.
"Now its time for infiltration." I said as I pulled my hood over my head.
"We're not assassins, we don't have the ability to hide in plain sight like you." Charm complained.
"You have a helmet that covers your face if the visor is down, while jack can sneak across rooftops thanks to his skills from being a former assassin." I shot back which silenced Charm. "If there's no more complaints, let's go."
We entered Ponyville without any incident and we were almost at the golden oaks library when I saw Jack get knocked off the rooftop he was on and fall to the ground. As he got up, we then were blinded by a bright flash, and when it subsided I saw Princess Celestia clad in golden plate armor escorted by a dozen armored guards.
"SURRENDER HUMANS!" She shouted in her royal canterlot voice.
The three of us said the same thing as we drew our weapons: "BRING IT ON!"
Author's Note
G36C (For gun noobs)

M468 (Also for gun noobs)

Lost blades of Equestria (REWRITE)
"SURRENDER HUMANS!" Shouted Celestia in her royal canterlot voice as she conjured a blade of solar energy. She outnumbered us four-to-one and had the element of surprise but the three of us all had the same answer:
"BRING IT ON!" we shouted as me and Jack fired our rifles and Charm charged the guards with her broadsword drawn.
"Why do I here boss music?" Jack asked me when this music played faintly as we dropped Celestia's escort guard .
"I have no idea." I answered as the last of the guards fell to our attacks.
Elsewhere in ponyville...
Pinkie Pie was making cupcakes when she suddenly ran out of sugarcube corner, pulled a boombox out of nowhere, put it to 'Where is your god now', shouted "BOSS FIGHT!" then ran back inside and went back to making cupcakes.
"BOSS FIGHT!" I barely heard it over the sounds of our guns and the boss music as me, my friends, and Celestia fought. I fought dual-wielding my short-sword and G36, parrying Celestia's solar blade with my indestructible short-sword before I fire a burst from my G36. Jack avoided attacks as he fired his M468 on full auto and Charm fought Celestia head on alongside me. Celestia's magic armor protected her from our attacks but we knew it couldn't be infallible.
"YOU HUMANS ARE A DISEASE THAT I MUST CLEANSE! WHY MUST YOU RESIST THE INEVITABLE?" She shouted as I blocked another attack from her solar blade.
"We're not resisting the inevitable, we're defending ourselves from a psycho!" I shouted back while firing another burst of 5.56x45mm NATO rounds before I rolled under a magic blast.
"STOP!" I heard somebody shout as Celestia was thrown back by a magic attack. I looked behind me and saw Twilight, her horn glowing and in her hand was a knife. "Princess, this has to stop!"
"My faithful student, what are you doing?" Celestia asked Twilight.
"Those three humans saved my life, I'm just returning the favor." Twilight answered, meanwhile we (somehow) snuck away from Celestia and the last thing I heard from their conversation was the sound of clashing steel and one last sentence from Celestia.
"You chose the wrong side Twilight Sparkle..." I began running faster when I heard those words. It mirrored what my father said as he disowned me when he joined the templars and tried to kill me.
We managed to sneak onboard a train and ride to Canterlot, we then snuck through the city in search for any sign of the Assassins. We were in an alley when we heard a commotion coming from the main road.
"That's low, even for Celestia." Was all I said as I saw Twilight being carted to the castle with a sign on her neck saying 'TRAITOR' in bold letters.
"Lets rescue her." suggested Charm.
"Are you crazy?! She's going to be either thrown to the dungeon or executed! How are we going to rescue her?!" Jack asked.
"I say we rescue her." I backed Charm up.
"Fine, but if it comes down to saving her or saving myself, I will save myself." He reluctantly said.
We followed the cart from the shadows until they arrived at their destination. The castle doors opened and Twilight was escorted inside. We entered through an unguarded side entrance and made our way through the castle.
We stole a map of the Castle from the gift shop and used it to find the dungeons. I assassinated the entrance guards and Jack broke the door down before Charm took down the inner guards.
"Twilight Sparkle, are you here?" I whispered as we passed empty cell after empty cell.
"Over here." was the answer from a solitary confinement cell to my left.
"Stay away from the door." I said before I let loose a burst into the lock. I then yanked the door open and saw that twilight was in even worse condition than when I saw her in the way here.
She had whip marks and bruises all over her body and had a black left eye. She also had a inhibitor ring on her horn, I broke it off and lockpicked her chains off while Charm did her best to treat Twilight's wounds.
"Come with us if you want to live." Jack said, Twilight was hesitant but agreed when she heard the sound of guards approaching.
"Thank you for rescuing me." She said as we ran out of the dungeon. I assassinated any guard we passed and we somehow escaped. We then ran to the train station and snuck aboard a train heading to Vanhoover. We stayed in the baggage car and rode the train in silence.
Celestia was heading to the dining hall when she heard the alarm go off. She ran to the dungeon and when she saw that Twilight was gone, she assembled her templars to hunt Twilight and the humans down. She then went to her room, fell down on her bed, and screamed.
It was almost sunset when we arrived at Vanhoover. Our priority was to disguise Twilight so she wouldn't be recognized. We robbed an empty clothes store and stole a dark blue hoodie and some camo pants, the clothes made her look like a guy which helped with our objective.
"There, now your unrecognizable." Charm said as she gave twilight a mirror.
"Thanks for your help, but what now?" Twilight asked us.
"We'll get you to a safe place and then go and confront the tyrant Celestia." Jack answered.
"I just realized, you never told me your names." She said.
"I'm called Shadow, Assassin by blood and a proud Filipino." I replied.
"Name's Jack, Templar convert and British citizen." Jack said.
"My name is Charm, an American and neutral to the two previously mentioned groups." Said Charm as we left the clothes store.
"Where are we going?" Twilight asked as we walked through the city, it was around eight at night already so most ponies were either heading home or already there.
"We're looking for the assassins." I answered. "Their base would be the closest thing to a safe haven that we can get."
"We're being followed, three armed figures." Jack said, only then I noticed the said figures.
"Their weapons?" I asked jack as we turned a corner and was out of sight for a minute.
"Crossbow, Sword, and Axe. We'll need to fight them quietly so that means no guns." He answered as he drew his Saber.
"Ready?" Charm asked as she unsheathed her broadsword. I drew my short-sword as I answered.
"We go on three. One...Two...Three!" We then turned the corner to face the three figure who were following us.