Walther and Quentin had been bent over something on the counter. They straightened and turned at the sound of my voice. Walther smiled. Quentin didn’t bother with the preliminaries. He grabbed a paper cup and trotted over to me, holding it at arm’s length.

“Here,” he said. “Coffee.”

“And thus am I reminded why I allow you to live,” I said. The coffee was cold and the “creamer” had never seen the inside of a cow, but I didn’t care. The caffeine was all I needed. I lowered the cup after chugging a third of its contents, asking, “What’s our status?”

“Come in, come in,” said Walther, beckoning me forward. “And close the door.” His glasses were askew, and his hair was mussed. Not enough that anyone who didn’t know him would notice, but Walther worked very hard to maintain his superficial “I am the perfect professor” appearance. Mussed hair didn’t go with that ideal.

“Long night?” I asked, doing as I was bid. The office was considerably dimmer once the light from the hall was blocked. All the overheads were off, leaving us in a room that would have been substantially too gloomy for mortal eyes.

Good thing none of us had mortal eyes. I sipped my coffee as I walked across the room, drinking more slowly now that the first rush of caffeine was in my system. With the ambient light blocked by the door, it was apparent that whatever Walther was working on was glowing faintly, like a light stick the morning after Halloween. It was a steady glow, at least, and not a candlelight flicker. I hate candles.

“I was already here when you called, tinkering with some personal projects. You just focused me,” said Walther. He turned back to the counter. “I’m not technically supposed to be here today, but I knew no one else was using my office, so I just kept going.”

“He took a break for breakfast,” said Quentin helpfully.

“I bet he did.” By the time Quentin got to campus, he was probably so focused on food that he could have convinced an invading army to stop long enough to get some oatmeal and bacon. Teenage boys are good that way. “Is it safe to assume we’re all standing here in the dark because you managed to make something we could use?”

“I wouldn’t use the word ‘safe’ when talking about this stuff, but yes.” Walther picked up a beaker with excruciating care. He was wearing heavy gloves, and he still looked uncomfortable holding the thing. It was half-full of a viscous liquid glowing a soft, somehow menacing shade of orange. I looked at it and had absolutely no desire to get any closer.

Too bad I was going to have to get closer—a lot closer—if I wanted the stuff to be of any use. “Is this the power dampener?” He nodded. “Tell me about it.”

“For a start, do not ingest. The only way this could be more toxic is if I milked a rattlesnake into it to add a little extra zing.” Walther put the beaker down, looking relieved when it was safely on the counter. “It’s meant for topical application. Skin contact triggers its effects.”

“Which are…?” I prompted

“It blocks all access to higher magic for a year and a day. No illusions, transformations, blood workings, anything. I’m not sure what would happen if you spilled it on a shapeshifter, so let’s try not to find out.” Walther grimaced. “If there’s a counter for the stuff, I haven’t been able to find it. It takes about twenty minutes for the effects to stabilize, but they’ll kick in almost immediately.” He picked up another beaker. This one was filled with pale green liquid that didn’t glow at all. “Scrub off all traces of the potion with this and you should be fine—stress on should. I wouldn’t want to wait until minute nineteen before I started looking for a place to rinse my hands.”

“Got it. At least there’s a window.” I eyed the open beakers. “Is there any way you can decant those into something we can carry without worrying about spilling things on ourselves every time we hit a pothole?”

“I was working on that when you showed up.” Walther traded beakers again, waving me and Quentin back. He didn’t have to tell us twice. We stepped clear before he began pouring the glowing liquid into a set of thin-lipped glass jars. “This isn’t the most stable thing in the world.”

“Is it going to explode?”

“No, but it may modify its own properties if you wait too long to use it.”

That didn’t sound good. “Modify how?”

“Maybe it’ll stop working. Maybe it’ll turn permanent. I have no way of telling. Alchemy is half science, half magic—and when it’s something like this, all guesswork.” Walther’s shoulders sagged as the last of the glowing liquid trickled into the final jar. He turned to place the beaker gingerly in a waiting basin. Catching my curious expression, he said, “Milk. That should neutralize the potion on the glass, and if I leave it overnight, it’ll be safe to handle.”

“This becomes a more and more exciting adventure.” I finished my coffee, setting the empty cup down on the nearest desk before saying, offhandedly, “Someone tried to flood the Court of Cats with lava. Chelsea was there, but I don’t think she did it.”

“Was anyone hurt?” asked Walther.

“Tybalt was killed, but he got better. Kings of Cats are annoying like that.” The words felt odd. It was odder still to realize that they made total sense to me. “There weren’t any other serious injuries that I saw. I was a little distracted trying to figure out where Chelsea had been.”

“Did you?” asked Quentin.

In answer, I dug out the charm the Luidaeg had provided and held it up, letting him see the way that it was glowing. Then I paused. “Hey. Get yours out. I want to see something.”

Quentin frowned, looking puzzled, but did as he was told. His charm was still dark. I leaned over and tapped it with my own charm. There was a chiming sound, and the charm in Quentin’s hand flared into sudden light. He yelped, nearly dropping it. I made a grab with my free hand, closing my fingers around his before he could let the charm go.

“Careful,” I cautioned.

“What did you do?”

“My charm was already tuned to Chelsea. Touching it to yours passed the tuning along.”

“You could’ve warned me,” he grumbled, giving the glowing charm a mistrustful look before sliding it back into his pocket. “Now what?”