Somewhere deep in the infinite space of the universe...
He could feel the power. Even halfway across the universe, he could sense Miles was strong enough to actually put up a fight. If he wanted to kill the universe, and rule all of reality, he needed to take out the first and last line of defense. In a way he couldn't believe it. His power and destruction for over a millennia led him to where he is now, and a puny mortal took only a day or so to match his strength.
He laughed at the thought, disregarding and doubting Miles.
He had one more thing to take care of before he headed towards Tails.
He could sense the galactic guardian was near. Frostmourne warned him of an impending attack. At this point, he wasn't worried. He was killing for sport and glory.
Pebbles and stones tumbled down next to his foot. In almost an instant, he grabbed Frostmourne and swiped right, predicting where the guardian would be, but no luck. The guardian dodged the attack and stopped in front of him. It was a Terantön species. A female guardian with her sword. An easy kill for someone so weak.
He laughed knowing this would be quick. He began to raise his hand, but stopped. He wanted to use his magic, but no: The fight is already unfair enough.
Without warning, he swiped left, then right, not trying to hit the guardian, but her sword.
The guardian blocked as an instinct. There Arthas has her. Frostmourne glowed with power as he swiped left once more, shattering the galactic blade into pieces. The force of the strike sent the guardian back a couple feet, stunning the Terantön. He wasn't finished. Not yet.
The Terantön knew it so. She looked at him, walking closer, and looked at the sun setting in the distance. He too, stopped and looked at the sun. And there, for a brief second, he let the guardian brace for her next life.
Arthas put one foot on her chest, and held his blade with both hands.
Faster than he could blink, the blade pierced the guardian through the chest and into the ground. Frostmourne collected the soul as Arthas sheathed it.
Another Galaxy, left a defenseless husk. That didn't matter to him though. He raised his hand and cast a portal. He knew where he was going next. He looked at the sun once more, and walked through the portal.
Once he walked through, the portal closed behind him. He knew this was the place.
"Mobius."
END OF CHAPTER FIFTEEN, THE GUARDIAN