From Reach to Equestria

Location: ship breaking yards, Asźod, Reach

Holding his MA37 Assault Rifle with one hand, Noble 6 looked over the horizon at Reaches landscape, or what was left of it, he suddenly heard Jorge-052 in his head, his last words to be exact, "Tell them to make it count" as the words finished he saw multiple Covenant Phantom and Spirit class dropships.
He drew the assault rifle he was holding and started firing towards the Elites that just deployed out of the dropship, soon enough Noble 6's shields dropped and his visor cracked, he fired the rest of the mag into an Elite zealot dropping its shields making it go into a frenzy before he ran into a partially destroyed building.
As he entered the building he slid into cover and reloaded his rifle as his shields recharged, after the rifle was reloaded he shot at more elites, "The longer I fight the more of them show up," noble 6 thought as he continued his efforts to survive, he was distracted by Elites firing plasma, and was suddenly picked up by an Elite ultra who hit his visor making it crack further.
Noble 6 reacted quickly as he pulled out a combat knife and stabbed the Elite ultra in the throat, dropping onto his knees he tried to stand up in order to not let another Elite grab him, but it was futile in the end.
Looking for his assault rifle he heard the voice of another member of Noble team, it was the voice of Kat-B320 and it he remembered her saying, "Where does he get off calling a demolition op priority one-"he remembered how she didn't even get to finish talking as she was interrupted by a projectile from a Gadulo-pattern needle rifle imbedding itself in the back of her head, but he knew that the voices were all in his head.
There was another Elite zealot on top of him now, he tried to get the large Sangheili off him but it was too heavy, but then he saw a flash of light in the corner of his visor.

Location: Canterlot Castle, Canterlot, Equestria

Miserably, Princess Celestia sat in throne room during day court, she was listening to the whining of Canterlot nobility over simple stuff like removing all farms to make way for more profitable businesses, of course she wouldn't do anything about it, but it was still part of her life, a dull part of her life to say the least.
She was interrupted by a flash of light and a letter falling onto the floor, she used her magic to pick up the letter and proceeded to read it despite the nobles whining against it.

Dear Auntie Celestia
King sombra has returned to the crystal empire and he will do something evil,
please gather the girls.
Your loving niece Mi Amore Cadenza

Upon reading the letter Celestia closed day court and summoned a roll of parchment the noblity whined more before Celestia said in the royal canterlot voice, "A matter which requires my highest priority has appeared, day court dismissed!"
She started writing in the parchment an urgent letter to Twilight Sparkle,

Twilight Sparkle
Bring the elements, this is a matter of national security, I will elaborate upon your arrival in Canterlot.
HRH Princess Celestia

Celestia sat in silence for a while with nothing but her thoughts to keep her company.

Location: Crystal Mountains, border of Equestria

Noble 6 awoke with a heavy migraine near the foot of a Mountain, he was wondering how he survived as the last thing he remembered was getting stabbed by the Elite zealot's energy dagger.
Noble 6 slowly got up and looked around, he quickly realised that he was no longer in Asźod on reach, in fact he had no idea where he was, "This place certainly looks a lot different to Reach" he thought to himself.
he saw lush trees so he decided that it would be safe to remove his mark V helmet, doing so he felt how cleaner the air felt to that of Reach, he kept his damaged helmet by his side as he didn't know if there were any hostile creatures on this planet and it would be better for the extra protection it could provide him.
Noble 6 checked if he had his weapons to only find out that his MA37 Assault Rifle was missing, luckily for him he still had a M6G Magnum and the combat knife, however the magnum only had 3 rounds in it, "That's weird, I don't remember using the Magnum."
Noble 6 picked a direction and began walking, he started to ascend the steep mountains, "hopefully there is civilisation on this planet otherwise I'm wasting my time," he muttered to himself, and so he continued walking, he got higher up the mountain, but then he heard his Noble teams leaders voice say "We've got a job to do, so let's stay focused and get it done. Six, are you in position?" he looked towards the way he came and saw a ghostly silhouette of Carter-A259, the ghostly figure eventually dissipated and Noble 6 continued on.
Once Noble 6 got to the top of the mountain he looked over the landscape and towards the other jagged, snow-capped mountain peaks he could faintly make out a black strange horse like creature with glowing yellow eyes and translucent wings staring at him," am I going crazy? Have I seriously started to loose my mind out here?"

Location: Canterlot Castle, Canterlot, Equestria

Twilight and the Elements of Harmony rushed into the throne room "Princess Celestia we arrived as soon as we got your letter!" Twilight yelled, Princess Celestia was taken out of her thoughts and began to explaining the situation to the group, "King Sombra has returned and he's taken over the Crystal Empire, You must assist Captain Shining Armor and Princess Cadence, They are already waiting there for you and they will tell you what the plan will be" The elements of harmony whispered amongst themselves before Twilight replied, "We will not fail you princess!"