Dream About New School Monster Attack

I had a dream where I was at a new school/ Academy, but I felt like something was off, so I had the school call my mom to pick me up at the end of the day. I went into my dorm room and was called down because someone told me my mom was in the building. So I went to one of the buildings where I saw a few people guarding an entrance to somewhere. A few guards were down and other guards started panicking. My mom was right near me. As soon as the guards saw the door open, they got down on their knees, closed their eyes, and put their pointer finger to their mouth as if they were shushing someone. And before I could as a question my mom made me do the same. There were these strange looking monsters that came out. They had a form but they looked like black smoke or ash. I went to go warn the other kids, and realized I couldn’t escape. The monsters destroyed a lot of things and put all of us through trials.