Cassian stepped into the classroom with a half-full mug and an eyebrow already raised. Luna and Colin waved the moment he appeared. He waved back, crossed to his desk, and dropped on it, taking a sip.

“Alright,” he said. “Today, we’re learning something I actually like.”

A Ravenclaw near the middle cut in without lifting his head. “You say that every time, sir.”

Cassian grinned. “And every time, Stone, I mean it. It’s consistency. Builds trust.”

He stood and scratched out on the board.

Revelio (Homenum)

“The reason I love this spell,” he said, “is because it works purely on intent. Except when it doesn’t.”

A few students blinked.

Cassian paced once across the front. “Revelio’s older than most of the spells in your textbooks. It didn’t start as a basic search charm to find humans or missing objects. It had a bigger, holier purpose.”

He flicked his wand. The chalk danced to life, scrawling a rough diagram of an eye split into three curves. Around it, ancient script.

“Right,” he said. “Let’s go back. I mean way back.

“The first version of this spell was made by a witch whose name didn’t survive, at least not in anything you’d pronounce correctly. Books call her Mareth now. That’s the closest thing we’ve got.”

He tapped the chalk. The eye spun a full circle then slowed.

“Mareth was a seer. Or something close to it. She lived up in the hills of what’s now northern Albania, back when that part of the world was still picking fights with the gods every other week.”

Luna tilted her head, probably intrigued by the idea.

“She wasn’t interested in people,” Cassian went on. “Didn’t care about the usual, charms, scrying for water, all that. She wanted to find the gods. See where they walked. Speak to them face to face.”

“Mad,” someone muttered.

“Brilliant,” Cassian corrected. “Mad comes later.”

He waved a hand. The illusion appeared, showing a woman bent over parchment, marks spreading.

Students watched the illusion, eyes wide, as she scratched the rough parchment with a reed quill. The voice was too fast to keep up with. Like she had somewhere to be and didn’t fancy waiting for ink to dry.

Cassian let them stare a bit longer before he walked up and tapped the floating image with his wand. The woman froze mid-sentence, ink pooled under her fingers.

“That’s Mareth,” he said. “This is from the Barkrun tablets. Most of it’s guesswork. She didn’t leave translations. Left burns, though. Lots of those.”

The illusion zoomed out. You could see the edge of the forest behind her, scrubby pines and high stone. Mist curling and everything around her looked like it was hiding.

“Mareth believed the gods still wandered the world. They weren’t floating in clouds, no, she thought they were hiding. Sleeping. Maybe sulking.”

He raised a hand. The chalk at the board twisted again, curling out symbols around the eye.

“She called it ‘Hunash’. Which roughly translates to ‘reveal what hides behind the skin of the world’. Dramatic. But accurate.”

He turned back to the students. “This was the first version of Revelio.”

He set his mug down, and let the illusion forward. Mareth was kneeling now. Circles drawn round her in ash and oil. Runes crisscrossed her arms, inked deep.

“She tried this spell three times,” he said. “First, it showed her something buried. Not divine. Just bones. But the shape moved. That was enough to call it a success.”

He pointed to the flickering image. “Second try, she aimed higher. Looked up instead of down. Asked for signs in the stars. The spell dragged her into a vision so sharp she started speaking backwards for three days. No memory of it after. Just woke up, blind in one eye.”

Luna muttered, “Worth it.”

Cassian nodded. “Possibly.”

The image shifted again. Third try.

“She tried one more time. This time, she asked the spell to show her a god. Any god. She didn’t care which. Her notes don’t specify. Maybe she thought all gods were equal. Or maybe she just didn’t want to waste parchment.”

The scene grew darker. Mareth stood now. Both hands outstretched. A curl of white light snaked up from her palm. It bent sideways mid-air. Then again. Then it folded in on itself, flickered and snapped.

The vision popped. Mareth was kneeling.

Colin asked, “What happened?”

“She failed.”

Luna tilted her head. “Didn’t she find even one?”

“No,” Cassian said. “That was the problem. She didn’t know what a god looked like. She’d never seen one. Never imagined one. So when the spell asked her to picture what she was searching for, she didn’t know how.”

Cassian chuckled. “But she didn’t give up. Mareth was sharp, stubborn, and just mad enough to think the gods owed her a face-to-face. She knew what the problem was. She didn’t know what a god looked like, and her spell couldn’t shape what her head couldn’t picture.”

He leaned back against the desk. The illusion behind him stilled, Mareth frozen mid-gesture, the half-finished runes hanging in the air.

“This is the trap every human-centred idiot falls face-first into. If you’re ever out there, sniffing around for gods, aliens, or anything that doesn’t come with a birth certificate and a wand, don’t assume it’s got to look like us. Or think like us. Or give a toss about gravity, lungs, or language. The universe doesn’t follow our rules, it doesn’t even notice them. It’s endless. Unmapped. And what it can spit out of the void doesn’t need permission from biology. That’s where most people trip. They keep looking for themselves in the dark.”

He swept his wand, and the board added another line.

ASSUMPTIONS LIMIT RESULTS.

“Bit of advice for when you lot go poking into ancient magic, forgotten places, or if you wake up one day and decide to summon something with more vowels in its name than common sense in your skull. NEVER ASSUME.”

The class stayed quiet. Ginny had her arms crossed, watching him without blinking. Colin had stopped halfway through writing and was chewing on his quill. Luna looked pleased. Probably already halfway through mentally planning her divine tea party.

Cassian tapped his fingers on the table to draw their attention back. “This is why Mareth failed. Not because the spell was wrong, but because her imagination couldn’t reach far enough. So she changed tactics.”

He flicked the illusion back into motion. The scene shifted, Mareth now standing at the edge of a sheer cliff, hair caught in the wind. Snow blew past her in sharp gusts. She wasn’t casting yet. Just waiting.

“She figured, alright, maybe I can’t picture a god, but I can picture a person. A human form. Arms, spine, whatever. If I’m alone, completely alone, then any person-shaped magic I sense should be an answer.”

Luna tilted her head. “But wouldn’t that just detect herself?”

Cassian grinned. “You’d think so. But the way she tuned the spell, she told it to find other. Not her. Not memory or echo.”

He raised his wand, and the board wrote again.

HOMENUM. INTENT: OTHER.

“See, most people these days use it for detecting humans in a room. Or on a battlefield. Aurors use it to spot intruders. But the original wasn’t made to find people. It was made to filter them out.”

He snapped his fingers. The illusion zoomed in, Mareth’s fingers twitching through the motions. The runes she carved in the ice glowed faintly. Her voice, high and fast, sang something that didn’t match any modern incantation.

Cassian turned back to the class. “This is the first version of Homenum Revelio.

“Later versions got simplified. Sanded down. ‘Reveal human presence.’ Helpful. Useful. Boring. But the bones of the original spell are still there. And if you want to cast it properly, really cast it, you need to think like Mareth.”

He pushed off the desk.

“You don’t cast this spell by saying the words and hoping your wand sorts the rest. You build it backwards. You think, what am I trying to find? What am I trying to separate from the rest of the world?”

He gestured to the chalkboard. “The reason most people get a foggy result is the weak intent. Unclear aim. They’re picturing ‘someone nearby’ instead of telling the spell what counts as someone.”

Ginny raised a hand. “But we’re not seers. We don’t know what we’re sensing.”

Cassian nodded. “Exactly. So you’ve got to make the spell smart. Give it rules. Shape the idea of ‘human’ in your head. It needs to be more than just a silhouette. Think temperature. Breath. Weight in space. Think of someone you’ve met. Picture the way they move, how they hold magic. That’s what the spell listens to.”

Colin frowned. “So we’re telling the spell what ‘human’ means?”

“No. As I always say about intent. You’re convincing yourself what ‘human’ means. The more precise the image, the sharper the result. If your idea of a person is just ‘arms and a head’, you’ll get blurry feedback. If you think about heartbeat, movement, the way sound shifts in a room when someone walks in, that’s when the spell hits properly.”

The vision continued. Mareth laughed as she sang, breathless with the thrill of it, and the spell finally answered. A thin line of light peeled away from her feet and stretched outward, tugging like a thread pulled from the world.

She followed it. Snow crunched under her boots as she hurried downslope, cloak snapping behind her. She broke into a run, nearly slipped, caught herself on a bare hand, and laughed again. Whatever she thought she was about to find, she wanted it badly.

The class leaned forward, holding their breaths. The light ended at the mouth of a shallow cave.

Mareth slowed. Her song faltered.

Inside the cave, something moved.

Pale skin. Long limbs. A shape that stood upright, shoulders hunched to fit the stone. Its eyes caught the glow and reflected it back. When it smiled, the teeth were sharp and too many.

The illusion froze there.

A sharp intake of breath came from the Gryffindor side.

“What is that?” one of the girls asked.

“A lugat!” Luna said, delighted, as if someone had just pointed out a rare bird.

Cassian glanced at her, really surprised. “Yep. That’s a lugat.”

A few heads turned toward Luna.

“You knew that?” Colin asked.

She nodded, pleased. “They live near old settlements. Not villages, exactly. Places where people left suddenly. They copy us badly.”

Cassian snorted. “That’s one way of putting it.”

The illusion unfroze and played out the last few seconds again. Mareth took one step closer. The creature shifted, nostrils flaring. Hunger clear in its eyes.

“You see the problem,” Cassian said, tapping the wand against his palm. “Mareth asked the spell to find something human-shaped that wasn’t her. Arms. Legs. Standing upright. That was her definition.”

He pointed at the creature. “And the spell did exactly what she asked.”

He glanced at the class. “If she’d lived somewhere else, she might’ve picked up a monkey. Or a gorilla. Chimps. Sloths, if she was unlucky and patient. She lived in Albania, so she got a lugat.”

That earned a ripple of laughter.

He took the chalk again, adding two lines.

INTENT ≠ WISH

INTENT = DEFINITION

He leaned back against the desk. “Mareth didn’t fail because she was foolish. She failed because she assumed she knew what she was looking for.”

The illusion shifted again. Mareth stumbled back from the cave, shock written clear across her face. The lugat hissed, sound scraping against stone.

Cassian flicked the illusion away. The classroom felt colder without it.

“So,” he said, “lesson one. If you cast Homenum Revelio thinking ‘show me people,’ magic hears ‘show me shapes I associate with people.’ It does not care about your intent if you haven’t bothered to finish the thought.”

Colin frowned. “But we’re taught it as ‘reveal human presence.’ That’s… the incantation.”

“And the incantation is a shortcut,” Cassian replied. “A late addition. The words don’t define the spell. They trigger a structure that already exists. If your head’s empty behind them, the result’s empty too.”

He crossed the front. “That’s why Aurors get false positives in ruins. Why old wards light up in forests when nobody’s there. The spell’s picking up echoes. Remnants. Things that fit a vague outline of ‘human’ because nobody bothered to tighten the definition.

“Now,” he said, “this is where it gets interesting.”

He flicked his wand again, and a new image formed. Mareth, weeks later, seated at a rough table, ink stains up her arms. The same eye symbol filled the parchment, but this time it was ringed with words.

“She didn’t scrap the spell,” Cassian said. “She was too stubborn to give up… So, she refined it even further. That’s what good spellcraft looks like. You don’t throw it out when it misbehaves. You work out why.”

The image zoomed in on the notes. Crude sketches of figures. Some crossed out. Some circled.

“Mareth rewrote her definition of ‘human.'”

He pointed to the board again. “Living. Aware. Capable of choice. Carrying magic in a way that responds to intent.”

He smiled, faint and proud, like a man admiring a clever ancestor. “She was six centuries ahead of her time.”

Colin blinked. “Did she ever find a god?”

Cassian snorted. “No. But she did find three hidden villages, two ambushes, and one very embarrassed cult that thought nobody could see them.”

A few laughs broke out.

“The point,” Cassian said, raising a hand, “is that spells evolve because people argue with them. Homenum Revelio is not a finished thing. None of these are.

“Every time you cast it, you’re reinforcing a version of it. Your version. That’s why two people can cast the same spell in the same room and get different results.”

Ginny frowned. “So if someone keeps casting it badly…”

“They train it badly,” Cassian said. “Exactly. Magic remembers patterns. If you always half-think your spells, they’ll keep answering halfway.

“That’s why I teach you history,” he said. “Not because I care about dates. I care about mistakes. People have already made most of the errors you’re about to make. Might as well learn from theirs instead of adding new ones.”

Luna raised her hand again. “Professor?”

“Mm?”

“If someone didn’t picture humans at all,” she said, thoughtful, “but asked the spell to show them anything that thinks like them… what would happen?”

Cassian considered that.

“Then you’d get something very strange,” he said. “Or very honest.”

She smiled, satisfied.

He turned back to the board and drew a box around the spell name.

HOMENUM REVELIO

Ginny leaned back, arms uncrossing. “So the spell’s only as good as the question you ask.”

Cassian pointed at her. “There it is. Write that down.”

Several quills scratched.

He took another sip from his mug, grimaced at the cold tea, and carried on anyway.

“One more thing about Mareth,” he said. “She survived that lugat because she reacted fast. She didn’t panic. And well, lugat didn’t like the sunlight.”

The illusion flickered back for a final moment. Mareth, standing at the cave mouth. The lugat recoiled, shrieking.

“She learned something that day,” Cassian said. “That spells don’t protect you from your own assumptions. Only clarity does.”

He waved the image away for good.

“I want you to think. Next lesson, we’ll talk about what happens when people define ‘enemy’ badly. Spoiler. It never ends well.”

He glanced at Luna. “And yes, Lovegood, that includes things you can’t see.”

She beamed.

Cassian picked up his mug again and leaned against the desk, looking over them with an expression that said he was enjoying himself far more than he probably should.

“Homework,” he said. “I want a page on how you would define ‘human’ for Homenum Revelio. What stays in. What gets filtered out. And why.”

They all groaned way too dramatically.

He smiled anyway. “If Mareth could rewrite a spell that nearly got her eaten, you can manage a page.”

The bell rang.

Chairs scraped. Bags were slung over shoulders. Conversations sparked up at once, half of them arguing about lugats, the other half about definitions.

(Check Here)

What do lurkers and ancient ruins have in common?

Strong signs of activity. No written record.

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