I had this dream a week or two ago, but still wanted to share it here.
If you've ever played Dead Rising 2, the best way I can describe these zombies is they are similar to the zombies toward the end of the game that mutate after inhaling that green gas. If you haven't played that game, these zombies are basically faster, more aggressive, and can take more damage than regular zombies, and the only way you were guaranteed to kill them was by shooting them in the head.
Anyway, the dream started at night, sort of like an opening to a movie or video game, fading in from darkness with me and one (female?) friend walking down a small street where we parked the car, heading toward a big, newly-built high school where they were hosting some sort of pep rally. As we were walking toward the school, I knew in my head what types of zombies were going to ultimately be dealing with tonight, almost like I had done this before (like re-playing a mission on a video game). It was calm and quiet, with nobody having any idea what was going to happen tonight except me and my friend. It was the "calm before the storm".
There is a big chunk of my dream missing, but the next part I remember is I was in the administrative section of the high school, which sort of reminds me of the building where I work, but with a completely different layout. My friend was no longer with me, but now this cute girl I used to have a crush on, and she was showing me where the hidden armory is located (an armory in a school?? I'm not sure why!). She knew of the urgency of getting to this armory because all hell was about to break loose in the school, any second now, and there was no time to warn people (although that's what my friend was hoping to do anyway). I told the girl, "I already know where it's located, but thank you for showing me!" as she pushes a button, and this big vending machine slowly swings open to reveal a hidden door in the wall. I already had a key fob to grant me access, so I used the fob, opened the door, and proceeded in with this girl.
We got to a second set of security doors, and before we passed through those, I remember this girl gently putting her hand on the back of my neck to sort of comfort me, and I could almost feel that, like it actually happened. We made it to the main security room, which was about 30 feet wide and 30 feet long, and had a ceiling that was probably 20 feet tall. There were some huge screens, along with a lot of smaller screens, all from surveillance camera feeds around the school. Not to mention the ENTIRE WALL of modified guns, almost like some type of enthusiastic gun collector worked in the security room. A lot of the guns had custom paint jobs, various attachments, etc. I particularly remember seeing a P90 with a cherry red paint job. Anyway, I knew everything was basically going to be okay now that we found all these guns and ammo.
Before we could proceed, I had to stand on a dedicated platform and let the security system scan my body to verify it was me, and it allowed one other person to be authorized with me as a guest, as long as she stood on her dedicated platform, too. The girl didn't realize what she had to do, so the verification failed twice, but after I explained what she needed to do, we were granted access to proceed forward in the room.
My friend from the beginning of the dream entered the room, and she knew she wasn't allowed to move past a specific line in the room, so she waited while we made our selection of guns...and then I woke up.