Beacon's Urban Legends

It was a blood moon when it happened. Grim was just out for a walk, meanwhile looking at the beautiful starry sky. As he looked at the moon, he saw it slowly turning blood red. He stopped to look at this marvellous wonder of nature, only to notice the moon slowly growing bigger and becoming brighter. The stars disappeared and the sky turned a dark shade of blood red. Confused, he looked around. To his surprise, he was no longer in Beacon. His surroundings had somehow transformed from the school he worked for to an unfamiliar, cave-like, hellish environment. He looked at the moon again just to find out it was actually an orb of blood red aura. He quickly reached for his weapon, but for some reason, he didn't have it on him. 
"Greetings, Grim", a demonic voice coming from the orb said. "You have been summoned here for reasons that cannot be comprehended by mere human minds." 
"What the hell is this place?", Grimm asked the orb. He could hear laughter coming from the orb.
"This is my domain. You shall now always be my slave." No way he was going to let that happen. He teleported to the orb and smashed it with his fist.  
"Let me go", he demanded. The orb glowed brighter and launched itself toward Grim, but he teleported away. 
"Slave, give up. You are never going to take me down with mere human powers." The words of the orb resonated through the cave. 
"Very well," Grim said, grinning evilly. "if I can't take you down with human powers, all I have to do is take some of yours!" He teleported to the orb and smashed it down to the ground. Once it was there, he held it to the ground and used his semblance to teleport its evil demonic powers out of the orb, into his own aura. His eyes lit up. He felt like he finally understood everything! He knew what created Grimm, why Grimm disappeared the moment they died, and he knew- and the effect wore off. His body got used to the demonic powers surging through it. The ball exploded and a gigantic demon appeared in its place. It roared loudly and it shot a beam of demonic aura Grim's way. He quickly dodged it and shot smaller beams of evil laser out of his palms at the demon. The demon didn't seem to be bothered by it at all, so he came up with a different plan. He shot the pillars, causing the roof to collapse directly at the demon. 
After most of the dust had cleared away, he saw that the demon was slowly fading away. A smaller orb gently hovered Grim's way. When he reached out a hand to catch it, it flew right through it towards his face. It then nestled itself in his eye. Grim cried out in pain as the orb replaced his eye. He fell to his knees and stared at a small, conveniently-placed pool of reflective yet demonic water. One of his eyes was glowing red. Spooked, he got up and ran in a random direction, keeping his hand on his eye. He ended up running to where the demon used to be. A few lesser demons ran towards him. They knew he had killed their king, and they were now going to get revenge.
"Don't come near me!", Grim yelled, removing his hand from his eye. His piercing gaze put the lesser demons instantly to death. "Get me out of here!", he demanded from whatever brought him there. His piercing eye created a hole in space and time. He was sucked through and it closed behind him.
He fell on his face. He quickly got up and looked around, making sure to always cover his demonic eye. He was back in Beacon. He had no clue what just happened, but he was going to need an eye patch from now on to make sure no one would get hurt. He decided he would never use his demonic abilities unless he absolutely had to.

Thunder crackled in the distance. Grim was in his bed, staring at the ceiling. He was thinking about some weird kids when suddenly lightning miraculously whipped directly at his window, smashing it to pieces.
"What the heck just happened!", Grim cried out in surprise. Not even a second passed and lightning struck through the window at the floor. A demon stood where lightning had struck.
"Come with me", the demon said.
"No way", Grim responded, immediately getting up and grabbing his weapon. He aimed at the demon and blew its head off. The demon disappeared the same way creatures of Grimm did. His heart was still beating really fast, and he took some time to just calm down.
Just as he thought he could get back to sleep, he felt like he was being watched. In a reflex he quickly looked around, but he didn't see anyone for a minute. After that, a weird translucent figure slowly became visible.
"Whooooo~", it said.
"Okay, what the hell", Grim responded, readying his weapon. The figure slowly floated towards him.
"Whoo~ I am the collective being of all the ghosts of the ones you killed. You must pay for what you did to us!", the ghost thing said, floating closer and closer to Grim. He had nowhere to run, so he tried to teleport away, but something inside him stopped him. The ghost entered his body. Everything went black for Grim.
When he came by, he was lying on the floor of some cellar. He got up and looked around. He was in the middle of a pentagram, and he was surrounded by hooded figures.
"What in the...", he muttered. The hooded figures all moved as one and shushed him. They all raised both their hands. Black smoke slowly started engulfing the room until he couldn't see anything but black. When the smoke cleared up, the hooded figures were gone and so was the pentagram. "What the hell..." He stepped to the door and opened it. The next room was lit by black candles. Weird ghost-like things were flying around freely. He teleported to the other side of the room. His eyes widened and his mouth was agape. In front of him was a gigantic memorial filled with the names of everyone he had killed. He felt chill to the bone. Something forced him on his knees. The memorial started to crumble, and that ghost from before flew out of it.
"You must pay for what you had done", it declared with numerous voices at once. It slowly flew closer toward him. It was this moment that Grim's evil eye activated. Its gaze burned through his eye patch and fixed onto the ghost. The ghost froze, seeming terrified as if it knew what just happened and what was about to happen. Grim's feet disappeared. In its place was black smoke. His eyes were wide open and he was smiling. Slowly his whole body turned into smoke, but his eyes and insane smile remained visible. He floated towards the ghost and devoured it with his smile-mouth. He heard clapping behind me, so he turned around. The hooded figures. He started to laugh like a madman and flew towards them. One by one he consumed them, paying no mind to the panicked screams.
After having devoured everything alive in there, he turned his eyes and smile to smoke as well and escaped the cellar. He flew quickly back to Beacon.
To this day, it is said that his smoke can be seen blocking the light of the moon every once in a while.