The Guardian
The Leviathon
The shell surrounding the Leviathon started to crack open and soon the corrupted creature entered the world. It's first task would be to destroy the Light creature then noothing would stand in it's way. It slithered toward canterlot along a wave of darkness.
Stone Blossom: Work
"Thanks come again," Stone Blossom said quietly. So much had changed this month. Her armor had killed her love and then left. She should have been crying but no more tears had come.
"Miss, this isn't what I asked for," said a colt. "I was supposed to get the number three. This is a number five."
"Sorry sir." She took the meal back and placed another order. Then it hit her. There was a feeling in her gut that something had gone terribly wrong. She looked around but couldn't find anything wrong. Its nothing, she thought. But then the ground started shaking.
"Earthquake," somepony yelled, but she new what was coming. A portal was opening somewhere.
The corruption: Their realm
An endless amount of creatures poured in from the portal the Leviathan created. Soon this world would be theirs and in turn, the entire dimension. The creatures charged over each other, eager to leave this universe and invade the next.
Stone Blossom: Street
She heard the screams as the Leviathan slammed into the castle. She saw as its huge tendrils crashed inside, destroying the top. She felt as the chunks of stone and marble crashed into the streets and homes below. She smelled the horrifying stench of corruption as it washed over fellow ponies. The leviathon scanned the city from its perch above the tower. Its strange, pupiless eyes landed on her and it started slithering down the tower, moving towards her.
She screamed and ran from the tidal wave of darkness closing in on her. She made it close to her house, when the Leviathan's jaws closed around her.