it took awhile to hunt for it but now you guys had it, an ancient relic full of malevolence, the shadow sand clock, and artifact used to store dark magic inside, making sure it doesn't escape, it was used in ancient times when witches were tainted with dark magic, they used it to expel all evil inside them purifying them into being their normal selves
this problem hasn't accrued to you until last week ghostly visit, a strange aroma filled in the air, it was expelled with darkness, flowing through the tainted wind, the people inhaling it's dark properties making them to heinous things, stuff out of their will a normal human could do,
thanks to castiel, his work came in handy after picking up the item and storing all it's magic inside, but as for now you, dean and Sam had a job to keep the sand clock in check, making sure it doesn't fall into the wrong hands
You've done months of studying on how this magic even came to exist around the town, was it from the mysterious death? demons?. it all lead you to dead ends, there's was still no leads on who or what made this magic to be existed, dark magic hasn't been used in awhile.
As night falls, Dean and Cas were still out looking on leads and weren't going to come back any time soon or tomorrow, so it was just you and Sam.
Things were fine until you heard a loud THUD, coming from downstairs, as you checked downstairs nothing out of a ordinary was missing, tv was still on, cleaned counter tops and light were still working just fine, until an unfamiliar glisten happened, the sand clock was broken,
the lights flickered and went out, a dark almost evil like laugh was echoing it sounded like Sam, 'Sam?' you called out, no answer.
You thought he could be in the bunker but he wasn't, until you found him, standing in the hallway, his eyes were pitch black, "good, you're here." the door telekinetic shuts and locks, he had an evil grin a tilted his head. "Oh c'mon..this new me is so much better..don't you think?"