Wait, I think I remember this one, I think as I walk through the front door to a large, white school building. Not well enough, though. Let's just not be in the way, this time.
I walk past what would have been my class room, down a hall that stretches seemingly forever. Next step, I'm at a glass double door at the end of the hallway. I turn right and head down some stairs and the world opens into floating platforms, students holding blue gems and flying around between said platforms in an artificial sky.
I take one of those gems from the shelf on the first platform and spend a few minutes remembering how this works. Just... pull from my brain, into my arm, and let my tendon be an easy guide for where to send the magic, out my thumb fat part and into the gem, and, I take of flying and fly well past the intended flight areas, where artificial, concrete platforms, flying students, and artificial sky give way to dingy darkness and stalagmite-like platforms, leading down into an endless abyss.
I make my way to the few crystals I remember existing and meet a girl. "What are you doing way out here?" she asks.
"The gems. Already know which ones do what, I just need a supply of them to have as much fun as I can. Fireballs and water jets and stuff," I respond.
"Not even the teachers know what most of these do, how can you?"
Shrugging, I ignore her and break off a red gem off the crystal outcropping, then fly off to find the blue one. I consider stopping by the yellow lightning one, as well, but I'd need the brown earth one to properly ground myself to break off a piece from there and that's too far out to reasonably get to in time.
A small flame juts out of my fingertips as I inject magic into the red gem, cutting through the blue crystal and releasing a gout of steam as the crystal instantly boils off. Taking my prize, I fly back to the school building, put the flight gem back on the shelf, and leave with my two gems. I'd need to reshape them to get the proper effects I want, but that's fine. I already have two gens capable of breaking each other.
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While walking up the stairs, I cut a few differently-sized and -shaped faces onto the gems. A triangle, a square, and a pentagon for the fire gem, leaving the rest rough, and three differently sized triangles, a pentagon, and a nonagon for the blue one. I join the next PE class heading out the double doors of the hallway and wait while they do their own thing.
The front of the school explodes, taking most the classroom I'd have been in if I'd done the same thing as my first arrival here with it. The whole world seems to flood as the school comes under attack from all directions. A few projectiles of various magical elements are launched at the track, but the PE teacher blocks any that would have hit a student as I start using the nonagonal side of the blue gem to move the water around me, swimming around at high speed.
The fighting in the school continues as I have fun swimming around and eventually, the reason for the existence of my red gem shows up: A guy in black robes flies out of the school and shoots a metal rod at me. I use the triangular side to create a concentrated beam of extremely hot fire, sublimating the metal fired at me, before creating a wall of water with the blue gem's pentagonal side.
It erupts into steam as the fireball behind the metal rod comes into contact with it and I'm swept up by a metal cart. Confused, I look at the only other person in the cart: Some senior I don't know. He creates rails for our cart around the school grounds, right below the mostly opaque water so they're hard to see, and we fly off at great speed down the rails.
"Thanks, I guess. I was just going to let him get annoyed until he left me alone, but this works, too. I get to watch from afar," I say before laying back with my arms behind my head, watching the fireworks of the attack on the school.
"You're pretty calm for someone who was just attacked. You with them, only attacked to distract your involvement further down the line?"
"Nah, I just get attacked a little too often. I thought a second row seat would have been better, but being this far from the school, it's actually cool to see all the magic flying around."
"Second row?"
"Being in the explosion wasn't fun, a front row seat lead to being injured and running away in fear for a few hours as I was taught magic more quickly than normal."
"What?"
I shrug and watch the magic flying around as we get further and further from the school, then wake up.