Inuyasha drew the Tessaiga. Salem stood and waited.
"The likes of you cannot kill me, I am immortal." Inuyasha stood with the Tessaiga in front of him. He smiled at her.
"That's never stopped me before." He raised the fang above his head. "Kaze no Kizu." He swung with enough force to shatter a boulder. The blade struck the ground and a wave of yellow energy ripped through the ground and everything in its path.
Salem didn't move as she thought it was nothing more than an illusion, until it hit her that is. It ripped through her body like a barrel of nitro glycerine against a wedge of cheese. The wave receded and nothing was left.
Thousands of golden flakes formed together in front of him and turned out to be Salem again.
"You cannot defeat me. I am immortal. The gods have made it so I cannot be killed by anything!" She was getting angry now, but Inuyasha couldn't help but laugh a little bit.
"And I told you that I've killed immortals before. If the Kaze no Kizu won't work, maybe this will." He raised the sword above his head once again. The blade turned black with parts of it showing swirling energy and white sparks all over it that looked like stars. Salem couldn't help but stare at it. In all honesty, she was curious about what her adversary would do next.
She got the answer to her thought as Inuyasha swung The Tessaiga down and blades of what looked like space went flying everywhere. They sliced through absolutely everything. Salem saw it coming, but didn't know what to expect from the mysterious blade.
One of the bigger slices hit her directly. Her vision went white and black as she seemed to be thrown across a dimensional rift into a world of bloody darkness.
"You will never escape from your eternal prison in Hell. Stay there and suffer for what you have done to this world. If you do ever return, know that I will be there, waiting for you, and ready to send you back to this place." Salem now had somewhat of an idea of where she was, but this couldn't have been what her world's afterlife looked like.
No. This was the afterlife of the person who had sent her there. She grew angry and let out a wave of wrath that covered everything around her. If she was going to be trapped here forever, than her opponent would stay with her and fight for the rest of time. She tried to grab hold of his will and pull him through, but the gateway had already closed, and she was trapped in Hell.
Inuyasha was outside the castle. He smelled something foul and followed it to its source. It was the pools of grimm. A black clawed hand came out of it as a creature of darkness pulled itself free from it's creation.
So, this is where all the monsters that roam this world come from. He raised the Tessaiga again and struck the grimm down.
"I'd better get rid of these." He lifted the Tessaiga above his head for the final time and leveled the entire region with the Meido no Kizu(it's like the Kaze no Kizu, but the Meido) Nothing was left after he was done. After a few years of hunting these monsters, they would fade away into mere legend as creatures that once plagued humanity, but were part of a long forgotten past. He sheathed his Father's sword and walked away from the once was battleground.