The basement of our Center City apartment building isn't technically mine, but the super doesn't care as long as I don't make noise or blow anything up. It's a cramped concrete box with exposed pipes running along the ceiling and ancient washing machines that rattle like they're possessed when anyone uses them. But on Tuesday nights, when most of the building's professionals are at happy hours or spin classes, it's empty enough to serve my purposes.

  I've set up a makeshift lab in the far corner behind the disused maintenance closet. Nothing fancy - just a folding table I found on the curb during move-in week, a laptop with a cracked screen Dad's IT department was throwing out, and a collection of household chemicals arranged in neat rows. No open flames, nothing that would trigger the smoke detectors. I'm not an idiot.

  "Okay," I mutter to myself, scrolling through the chemistry textbook PDF I downloaded. "Properties of common volatile compounds." The textbook is college-level - way beyond the basic chem class I'm taking at Bodine. But understanding what I can absorb and release means understanding the fundamentals, not just grabbing random aerosol cans and hoping for the best.

  I pull up the spreadsheet I've been building for months. Four columns: Compound, Vapor Properties, Absorption Feel, Deployment Effect. I'm methodically working through common household substances to catalog what my power can actually handle and what I can get my hands on in under ten minutes at any CVS.

  The trick isn't just absorbing anything that evaporates. The trick is understanding vapor pressure, molecular weight, and how different compounds behave when they're airborne. Dense vapors sink. Light ones rise. Some disperse quickly, others linger. Knowing which does what means knowing how to clear a room or cover an exit.

  I start with the rubbing alcohol. Pour a small amount into a glass dish, let it evaporate, draw the vapors in. Sharp and cool, like inhaling mint but sharper. I release a small amount near the candle flame - brief flicker as it ignites.

  Spreadsheet note: "Isopropyl - flammable vapor, rapid dispersion, ignites near open flame. Duration: ~5 min." Good for creating momentary panic, bad for anything sustained. Every drugstore has it.

  Next combination produces the same damn thing as the last three tests. I stare at my notes in frustration. Carbon dioxide. Again. How is CO2 such a common byproduct? I did the baking soda and vinegar thing the first week after I got my powers, back when I thought this would all be simple.

  I move through the next few tests faster. One produces ammonia fumes that make my eyes water even as I'm absorbing them - harsh, almost caustic feeling. Deployment creates an immediate gag response. Note: "Effective for area denial, but obvious. Can't use without everyone knowing something chemical is happening."

  Another creates a vapor that's heavier than I expected, sinks fast, clings to the ground. I watch it pool around the table legs before dissipating. Interesting. Could work for low-lying cover or ground-level displacement.

  The washing machine in the corner stops its cycle, and I glance at the time. Dad will be home in an hour, maybe less if traffic's light. I've got time for a few more.

  I work through two more combinations from my list. One's a dud - barely produces any vapor at all. The other creates something acrid that burns going in. I release it immediately, watching it form a thin, irritating haze. Probably too harsh to use without serious blowback, but I note it anyway.

  Then I get to the one I've been saving - theatrical fog juice from the drama supply store. Food-grade glycerin and distilled water. Same stuff they pump into high school auditoriums.

  I heat a small amount on the hot plate and watch the thick vapor rise. When I absorb it, it feels different from everything else - heavier, almost silky. I release some from my palm and white fog rolls outward, hanging in the air for several seconds.

  This. This is what I needed. How have I not found this stuff for so long? This is so good.

  I make detailed notes. Duration, dispersion pattern, thickness. The fog doesn't trigger smoke alarms, doesn't smell like chemicals, doesn't make people panic. Just obscures vision and creates confusion. I could deploy this in a building and walk out before anyone figured out what happened.

  My phone buzzes. Fifteen minutes until I need to be back upstairs.

  I run through three more quick tests, absorbing and cataloging each one. Most are variations on things I've already tried - different concentrations, slightly different properties, but nothing revolutionary. I'm building a reference library, not looking for the perfect solution. When you need to act fast, knowing exactly what you can grab and deploy is more valuable than having one spectacular option.

  The narrative has been illicitly obtained; should you discover it on Amazon, report the violation.

  I pack up quickly, tucking bottles back into my backpack, wiping down the table. No residue, no evidence. The chemicals all look innocent enough on their own - cleaning supplies, first aid items, stuff from the pharmacy. Nobody would look twice.

  As I head upstairs, I pull up my spreadsheet one more time. Twelve substances tested tonight, eight with viable tactical applications. The alcohol for distraction, the ammonia for area denial, the fog for cover. Everything else is backup, variations on a theme, options for different scenarios. And carbon fucking dioxide.

  Not that I need those skills anymore. This is purely academic. Scientific curiosity.

  At least, that's what I tell myself.

  South Philly at midnight feels more like home than Center City ever will. The narrow streets and tight-packed rowhouses remind me of Tacony, though the Italian market signs and murals are different. I've told Dad I'm at a study group that runs late - technically true, if you consider my self-directed chemistry research a form of study.

  The fight club meets in the basement of an abandoned boxing gym three blocks south of Passyunk Avenue. No sign, no advertisement - just a red light bulb above a metal door in an alley, and a bouncer who only lets you in if someone vouches for you. Fortunately, Marco vouched for me two weeks ago, after we finished that asbestos job in Chinatown.

  "ID," the bouncer says, a mountain of a man with tattoos crawling up his neck.

  I flash the fake driver's license that cost me three remediation jobs' worth of cash. It says I'm 21, but he's not checking for my age - just confirming I'm on the list.

  He nods, stepping aside to let me pass. "No recording devices, no powers outside the circle. Cover's fifty."

  I hand over the cash and descend the concrete stairs into the basement. The space opens up into what must have been a proper boxing gym once - now it's stripped down to bare walls, with a circle painted on the concrete floor and folding chairs arranged around it. A makeshift bar serves overpriced beer in plastic cups, and the air is thick with cigarette smoke and sweat.

  These aren't the clean, regulated fights sanctioned by the athletic commission. These are metahuman matches, power against power, with minimal rules and maximum spectacle. The only consistent rule: nothing that could collapse the building. Everything else is negotiable.

  I find an empty chair near the back and settle in to watch. The current match features a guy with metallic skin facing off against a woman who seems to be generating some kind of electric charge from her hands. They circle each other cautiously, the woman looking for an opening while the man's reflective surface gleams under the harsh lights.

  "First time?" asks a voice beside me. I turn to see a middle-aged woman with close-cropped grey hair and scars crisscrossing her forearms.

  "Second," I reply, keeping my voice neutral. "Still learning the rules."

  "Rules are simple," she says, taking a swig from her cup. "Ref calls knockout or submission. No weapons unless they're part of your power. No killing, obviously. Everything else is fair game." She extends a hand. "Marianne."

  I hesitate before shaking it. "Kay."

  "What's your ability, Kay?" she asks casually, too casually. I sense she's assessing whether I'm a potential competitor or just a spectator.

  "Nothing useful for fighting," I lie. "Just practical stuff. Work stuff."

  She nods, seeming to lose interest. "Practical, sure. Probably make good money too."

  In the ring, the metal-skinned fighter has caught the woman's wrist, absorbing her electrical discharge without effect. He throws her to the ground, pinning her with a knee to the sternum. She struggles, sending visible currents of electricity up his leg, but his metallic coating seems impervious. After ten seconds of futile resistance, she taps the floor, conceding the match.

  The crowd erupts in cheers and groans as money changes hands. I spot Marco across the room, collecting what looks like a substantial payout. He catches my eye and raises his cup in acknowledgment.

  The next fighters enter the circle - a wiry teenager who can't be much older than me, facing off against a heavyset woman with forearms like tree trunks. As they begin their match, I scan the room, cataloging faces, abilities, potential threats or allies. Old habits.

  "You looking to compete eventually?" Marianne asks, breaking into my assessment.

  "Just observing," I say, watching as the teenager suddenly splits into three identical copies of himself, surrounding the larger woman. "Learning."

  "Smart," she approves. "Most newbies jump right in, get their asses handed to them, never come back." She leans closer, voice dropping. "But if you change your mind, fights are Tuesdays, Thursdays, and Saturdays. Qualifier matches for newcomers start at 10 PM, before the main card."

  I nod noncommittally, eyes still on the fight. The teenager's copies are coordinating attacks from multiple angles, but the woman seems unfazed, her skin taking on a stone-like appearance as their blows bounce off harmlessly.

  Part of me - the part that trained in three different dojos back in Tacony, that practiced moves on a heavy bag until my knuckles bled - wants to step into that circle. To test myself against someone with powers, to feel the rush of combat without the life-or-death stakes.

  But I can't risk it. Can't risk being recognized, can't risk injury that would affect my legitimate work, can't risk the questions Dad would ask if I came home bruised and battered.

  But I want it. I have the same poison Sam does. I don't know if she's infected me or what. But I want it so bad. Maybe I just need to whack it more. Too hormonal. Too pubescent. I need to bite something.

  "Next up," announces the referee, a thin man with glowing eyes, "we have Rockslide versus newcomer Riptide!"

  I settle back in my chair, sipping a soda and feeling more at home in this underground fight club than I have anywhere else since leaving Tacony. Here, at least, people understand power - what it means to have it, to control it, to live with its consequences. I look around, keeping an eye out for anyone in a fancy suit.

  Life is tolerable. At least, that's what I tell myself.