Longer chapter this time. Hope you like!

"Twilight!" I called her name, looking around frantically, but she had disappeared.

"Um, Princess?" Applejack suddenly said nervously.

I looked in the direction her hoof pointed and my heart sank.

Sombra's shadow form loomed in front of us ominously. Twilight was levitated just below a pair of threatening yellow-red eyes, seemingly not tied up but still helpless. She looked at me desperately.

Meanwhile Sombra laughed. "What have we here? A unicorn with costume wings?"

"I am Princess Armonia, the fifth and final alicorn, prophesied by Starswirl the Bearded in ages past," I boomed in my alicorn voice and reared my forelegs off the ground.

Sombra laughed mockingly in reply. "Do you expect me to believe that?"

A rainbow-colored stream of magic flowed from my horn and enveloped Twilight, freeing her, bringing her back to me.

Sombra immediately settled into his unicorn body, eyes wide with shock. "What? Impossible!"

"Not with the magic of all six Elements flowing in me."

Sombra backed away slowly, looking genuinely frightened. I spread my glorious wings and rose above him. "Surrender now or face the magic of Armonia!"

Saying that Sombra looked really worried now would be the understatement of the century. Abruptly, however, his demeanor changed—he sneered slightly. "So you're Armonia, huh? Well, Armonia THIS!" A sudden attack of dark magic streamed from his horn.

The darkness poured down like rain around me. Each member of the Mane Six was in turn struck by the downpour and fell to the pavement, weakened. But to my surprise and Sombra's, the attack didn't touch me. I was completely protected.

Still hovering in my alicorn form, I charged my horn and magic the color of all six Elements swirled round me in a magical cloud. As Sombra's cocky expression twisted into terror, I spoke the final words I hoped he would hear. "You had your chance."

With that, I unleashed the full power of the Elements of Harmony upon the unicorn king.

A stream of rainbow-colored magic rained from my horn onto King Sombra—this must have been what Twilight saw at the battle of the bands, I realized. As the light grew brighter and brighter, I saw Sombra appeared to be turning back into shadow. Small puffs of shadow and darkness were dispelled in the stream of magic like leaves before the autumn winds. Sombra roared one final time in fear and fury.

And then he was gone.

But the spell wasn't over.

I next directed my magic toward Canterlot. The sinister darkness that Sombra had created began to dissolve like fuel in a fire as my glorious magic swept the streets. As light and dark magic collided and swirled together, I witnessed the most jaw-dropping event in Equestria since the first sonic rainboom.

Now I know I've talked about what amazing things I've seen in Equestria, but this one by far was the most powerful and incredible.

A supernova-like explosion of Elemental magic erupted from my horn and burst through Canterlot, dispelling the darkness and spreading my light and glory and magic everywhere it touched.

And then it was over.

I looked down at the Mane Six, huddled at my feet. My magic had reversed Sombra's final spell upon them. All were well again.

Twilight was the first to speak. "Princess Armonia, I don't know how we can ever repay you!" She kissed my hooves and wept for joy.

I longed to be in my anthro form again, and as I wished it, I felt the magic in me changing me again. I blinked and realized I once again had arms and legs—along with my pony ears, wings, and tail. The magic subjected itself to my will! I could transform when I wanted! How cool was that?

I quickly recovered from my surprise and knelt down to Twilight's level. "None of this would have happened if you hadn't saved me from King Sombra back in the Canterlot library archives." I smiled. "Don't you remember that?"

Twilight blushed. "I was just trying to protect you."

"And you protected Equestria too." I hugged the little purple alicorn and she hesitantly hugged me in return.

Finally I set Twilight down and stood up to address the rest of the Mane Six. "But I owe to this victory to the rest of you too. All of you helped me find information about the prophecies and find out how to summon the alicorn magic. This is your victory as much as mine." One by one I hugged each pony in deep gratitude.

Just then a voice from above surprised all of us. "Indeed."

We all looked up to see none other than Celestia, Luna, and Cadence descending from the sky. Their horns aglow, their wings outspread, their eyes bright, it was clear that their magic was totally restored.

"Princesses!" I rose to my feet in respect.

The three alicorns touched down in front of me and, to my surprise, bowed as Twilight had done. Twilight herself quickly joined them in their homage.

I felt embarrassed but strangely pleased too. I had saved Equestria with the help of something I never knew I'd need.

"You know something, everypony?" I asked. "Friendship really is magic."

YAY Sombra's defeated! Is he dead? Maybe... XD This is not the end of the story however! I've got several more chapters planned. Tara's trials did not end with the defeat of King Sombra!