I really haven't read much about Sylas' lore. I don't know/remember if it's specifically been clarified how he steals other people's magic, but whatever, I'll do my story my way.

…

Lux went through the pages of the book with a distraught look, slowly sliding to another and then another. A swirl of thoughts took over her head and put her in a dilemma. Sniffing unsatisfactorily, she tugged on the cover and closed it, adding it up to the tiny pile by her side. She messaged both of her temples to allay her headache.

She's been going through every book she could possibly smuggle into Sylas' cell. The problem was that she wasn't about to betray her nation for doing a "good" deed for a man who was partially off his rocker. He deserves to be free, perhaps, but up to what cost?

Dangerous, hazard magic in each of those books would only aggravate the whole problem. He was skilled in magic. She just needed to give him the staple so that figures how to break free… with the least amount of causalities. She of course knew some stuff, but fessing up would screw over her façade of silliness she's been building up since the first day.

It doesn't really matter if Sylas was a potential mass-murder, or at least her mind had recklessly shaken hands on it with her heart. After all, he was restrained. She's seen those rune carvings on the enormous manacles he wears. Nothing was going to go past that without specific information about it, and giving those away would stand as well for giving away Demacia's secrets. Something else had to be.

He's been growing restive lately and she was at loss.

"Unless…"

Lux's hand slithered towards a tatty book she'd put aside, making up her mind. It was bleak-looking and almost in full dark. She felt outright uneasy by just holding it, but she stopped at one cajoling title.

"Magic loan…" She shilly-shallied, but caved.

She grabbed a piece of spare parchment which was somewhere on the table and started scribbling down her own notes with a quill that was fished out of her pocket. She'll just twist it a little bit. Also she cared not to use her own handwriting.

After being done with it, she also jotted down haphazardly whatever information which looked compelling enough to fool Sylas. It wasn't a good idea to show up with just one meagre tidbit of dangerous magic. Maybe three will do.

The bookkeeper went past her skimping just a glance on her table, then moving away. She might've thought she'd hear shuffling. She then thought age was getting to her.

…

"I couldn't get ahold of any book. All of them are constantly being invigilated and taken stack of." She lied just half-heartedly. A bunch was true, just the latter. "The forbidden side of the library is no monkey business."

The books do are guarded by outer guards and, something that has been kept as a secret jealously, magic wards. However, the King didn't care about inner security then nor will do now. It wasn't long enough until Lux found her way in under her own steam. Poor bookkeeper barely knew where she was standing.

Sylas' looked at her askance. His initial scepticism was shrunk at the very moment she showed him her forgeries. He never tried to read into them. His eyes lit from the beginning to the very end of her shill talk. She played her role wonderfully and he, in exchange, explained heaps of hands-on magic stuff she mostly had already got wind of. Some that were indeed new to her were welcomed with a truthful look.

Throughout the whole chat she led him towards the possibly corollary she thought it was best without tipping him off of her knowledge. As expected, he was quick on the uptake and quickly schemed "something" which, naturally, wasn't shared with her. She simply could tell it by the look of his face.

Sylas' simpered at her at the end.

"So you're saying I can do that with somebody's else magic? That sounds awful…" She said disgustingly yet amazedly. At this point, he was on the clouds, barely paying her attention. Lux relented, not making an effort either. "I think I'll stick with my magic, mind!"

"You'd be surprised by how many things you can come up with." He replied ominously, snickering.

He was somehow not sore after having spent a good amount of time with his neck hanging awkwardly so to read the note on the floor; she wouldn't have it ahold for him to read. He didn't mind apparently. Lux took this as the cue to leave.

Standing up, she brushed dust off the lower part of her thighs and then the shin. "I'll get going. I really drew out this one and the folk might start wondering where I am." Which wasn't a taradiddle, either.

People actually looked up to her. It was good enough to make her forget about the bunch of horrible things she's made.

"I'll see you later, then, Little Light. Thank you."

"Anytime."

She's just abetted a criminal. Was she also one?