The guards stationed at the edge of Canterlot's city limits had not expected a spiky metal object to fly towards the city alarming speeds, but they attempted to stop it anyways; it was their duty to keep the city safe after all.
But their spears just bounced off of its metallic body, and the unicorn's magic bolts of energy was avoided easily. The creature quickly decimated the guards, scattering them, electrocuting them, and beat them.
Now a newer recruit was held in its metallic grasp. Being held by the neck, choking, and gasping for air, "P-please...s-spare...m-m-me...".
The creature loosened its grip slightly. The guard felt a glimmer of hope; maybe it would give them a chance to explain themselves, maybe it had attacked because they had attacked it.
The young stallion's glimmer of hope was extinguished as the metal blue being hurled him aside. The guard blacked out from the impact of his back against a wall.
Just before loosing consciousness the guard caught a glimpse of a blue creature, this one clearly not metallic, but just as fast.
***
"Hey, long time no see; Faker!" Sonic shouted as he delivered a sweep-kick to Metal Sonic's torso. The bot tumbled forwards, not prepared for the sudden attack.
"Target acquired; Sonic The Hedgehog" The blue bot growled in its sinister metallic voice.
"Just what do you think you're up to this time Metal?" The hedgehog asked.
"Mission objective is none of your concern" The bot droned.
"Alright then," Sonic said; rubbing the underside of his nose, "I guess we'll just have to beat it out of you!"
Before Metal could respond; the ground beneath the bot exploded. A spiked fist smashed into the bot's torso, and a second one followed up with a blow to the back of the head.
"What's the matter Metal, you getting slower?" Knuckles taunted as he landed on the other side of Metal Sonic. The bot tried to take off again, but was cut off by a blue orb smashing into him. The attack was followed by another punch to the back, the process repeated several times.
Then Knuckles accidentally threw a sloppy left hook at the robot. Metal managed to catch Knuckles by the wrist, and proceeded to kick and punch him, dodging attacks from Sonic, and allowing them to strike the echidna.
Metal landed a quick spin-kick, followed by a spin attack, and to finish it; Metal Sonic used a copied uppercut, which carried the same strength as the echidna's punch.
Knuckles fell to the ground, and stayed there. Sonic rolled into a ball, and charged at his double. Metal countered with his own spindash.
The fight wore on; Sonic and Metal Sonic, striking each other with identical attacks, all of which resulted in a stalemate.
Metal countered another homing attack with his own, but as sonic spun up his spindash, metal used a different attack: the indent on the front of his torso glowed pink, and when Sonic was mere meters from his robot double metal sonic fired his energy beam. The attack didn't kill the hedgehog, but it electrocuted him.
Sonic blacked out from the massive amount of power that had just been shot through his body. The shock, coupled with the fatigue of battle had made the effects of the beam slightly more devastating than if Sonic had been at full strength.
But the attack had cost Metal Sonic nearly all of his power reserves. Not wasting any time the bot shot towards the power source he had detected before.
***
Celestia was used to letters arriving at all points of the day, and two at once was not exactly a rare occurrence. But two letters, at the exact same time, and seemingly about the same thing, both from ponies she met daily; was somewhat surprising.
She read the one with her students wax seal on it first:
Dear Princess Celestia,
Some strange creatures have appeared in equestria, I've met four so far; Sonic, Knuckles, Tails, And E-123 Omega. But there is another one, Sonic says its his robotic doppelganger: Metal Sonic. We saw Metal Sonic heading straight for Canterlot. Sonic said he would try and slow Metal down, but he wasn't sure if he could stop him. Please be careful.
Your faithful student,
Twilight Sparkle.
Celestia acknowledged the information, and had quickly opened up the second scroll; this one had a seal with a symbol of two swords crossed over a golden shield: the insignia of the Canterlot Guards.
Your Highness,
A blue metal creature attacked our squad of guards. We had warned against entering the city at the high speeds it was traveling at, but it had ignored us. The creature easily defeated our squad, there were no deaths, but we need medical help. A second blue creature; that had spikes that stuck out of the back of its head, and a red one; that had dreadlock styled spikes confronted what the blue one called "Metal Sonic". They put up a good fight, but Metal Sonic subdued them both. They may need medical attention.
Private, Sol Flare
Celestia's eyes widened when the private mentioned the blue creature as having spikes on the back of its head. Was this the blue creature that, along with the black and red one, had managed to defeat her and Luna, and steal the jewel?
The sound of shattering glass, followed by the shouting of guards, and the sounds of energy discharges; was more than she needed to hear. The princess of Equestria galloped towards sounds of pain, and battle.
The shouts and clattering of weapons stopped, but the energy discharges continued.
Celestia opened the door with her magic, quickly forming a elegantly designed sword of golden shimmering energy. She heard another set of hoofsteps getting steadily louder. He attention was captivated by the two metallic figures that fought before her.
One was as twilight and the guard described; blue and with spikes coming off the back of the head, very similar to the creature, who she guessed was the one called "Sonic", she had fought before.
However; the one that "Metal Sonic" was confronting was the one that gave her a shock, and a slight scare.
Like Metal Sonic: it was more mechanical looking, with no skin or coat showing through the armor that covered its entire body. but that was the only similarity that Celestia could make out at the moment.
This other mechanical creature was a pony in form, but its tail was more like a dragons tail, longer and more flexible. The mechanical pony's mane was actually two individual head plates, that jutted straight out from the back of the pony's head. The pony's eyes were similar to Nightmare Moon's in shape, but the eyes of this pony were lime green glowing lights.
But what truly scared the ancient princess was the type of pony this ivory mechanical being was: an alicorn.
Celestia managed to see all of this in a matter of seconds, but Metal Sonic didn't need seconds to react to the princess's arrival. Metal shot at the sun goddess. Who threw up a magic shield, but it was a quickly made one, and slowed the bot down, but didn't stop him.
The princess was thrown to the floor, Metal leaping off of her to prepare another attack.
Celestia took the pause in Metal's attack to use her magic to blast him backwards, straight into the set of dual doors that kept the elements of harmony safe.
A wave of blue arcane energy struck the mechanical ivory alicorn, and sent her into one of the stone pillars that lined the room.
"Sister!" Luna's voice was music to Celestia's ears. The princess of the night helped her sister to her hooves, and raised her own shimmering sword of magical energy. Luna's sword shimmered midnight blue, was more jagged, and had a dagger like quality.
The mecha-alicorn was on her hooves as well, and, despite appearing to be a machine, had summoned its own sword. This one was blood red, and looked like a fusion of the sister's swords.
The mecha-alicorn glared at the sisters, and snarled "Nice job, you've just allowed Metal Sonic to recharge himself" The voice was definitely feminine, and dripped with sarcasm.
The blue bot got to its feet and charged at the mecha-alicorn.
"Chaos burst!" the alicorn called out; pointing the tip of her sword at the charging bot.
The bot glowed briefly, and then was sent flying backwards into a pillar.
Luna and Celestia both fired while the bot was down, getting two blasts to strike the bot. The last shot was blocked by an energy shield the princesses eye's turned towards the mecha-alicorn.
The alicorn lowered her horn at Metal Sonic. Her horn glowed for a second, then a shimmering trail of energy linked the two bots. With a start Celestia realized what was happening.
"She's draining Metal Sonic's power" Celestia exclaimed, before Luna slashed her sword through the link severing it, and causing the unstable energy to bunch up, like water in a hose when someone is stepping on it. The energy then expanded uncontrollably.
The resulting explosion sent Metal flying off of the mountainside, and into the forest below.
Celestia and Luna opened their eyes. The explosion should have sent them crashing into a wall, but they seemed to be untouched. The cause being a blood red shield that housed them, and the mechanical alicorn.
For a time the sisters and the bot stared at each other. The bot broke the silence, "Look I saved your flanks this time, but this doesn't make us friends".
With that, the mecha-alicorn shot into the air, dissappearing into the noon sky.