She named her Didy.

The name came softly, instinctively, like it had always belonged to her. The little hellhound lifted her head at the sound, tail swishing with slow, careful curiosity. The wounds on her back leg had closed cleanly, and her eyes, once wide with fear, now flickered with a quiet watchfulness.

Didy wasn’t large—barely reached Mer’s waist. But her presence filled the space around her with weight. Her thick black fur, especially full around her twin coiling tails, seemed almost too big for her thin frame. Her red eyes burned softly, not with rage—but with wariness. She was still young. Still learning.

Still dangerous.

Mer slipped a collar around her neck—a soft black band enchanted with a single mana stone at the throat.

Cecil insisted on one condition.

“It’s just a safety measure,” he said, sliding a second enchantment into the stone. “In case… something happens.”

The trigger words—“Tail down.” A soft phrase, unassuming, but the moment spoken with intent, the enchantment would activate and stun Didy into unconsciousness.

Mer didn't object.

In fact, she added to it herself. She strengthened the charm, weaving her own layered circle into the mana stone and embedding a second trigger—this one deadly, known only to her and Cecil. Not out of cruelty. But because she knew what the beast was capable of if ever turned.

The next few days, Didy remained in the dungeon, resting, recovering. A special stone chamber was prepared in the west garden, tucked near the greenhouse. Once completed, it became her new home—a spacious doghouse, crafted from reinforced stone, lined with runes, and fitted with a vented mana filter to keep her aura from overwhelming nearby magic.

Mer visited every day.

Sometimes, she simply sat with her, watching the way Didy’s tails flicked as she sniffed the wind. Other times, she would lead her around the garden on a long chain, trailing from her collar like a leash of black iron.

Frederick was the first to protest.

“A hellhound? In the garden? You want me to work next to it?”

He trembled visibly when he saw her the first time, pressing himself to the greenhouse wall like it might swallow him.

“She’ll protect the stones,” Mer said.

Frederick nodded—very quickly—and said nothing more.

Rox, in contrast, didn’t even try to pretend.

The moment he glimpsed Didy’s twin tails from a distance, he vanished. Avoided that side of the castle entirely. Claimed he was “allergic to animal fur,” though no one believed him.

---

But Didy changed.

As the days passed, the castle began to adapt to her presence.

Servants who had once flinched now greeted her. Some even snuck her scraps of meat from the kitchens when they thought no one saw. One older steward called her “the shadow puppy,” and she accepted the nickname with a low huff and slow tail swish.

Sarah, ever blunt, took to brushing Didy’s fur in the afternoons, sitting beside her with her skirts tucked neatly and a brush enchanted to never dull. At first, Didy growled—just once. But over time, she settled, leaning her head against Sarah’s thigh like a content cat.

Frederick even tried speaking to her.

“Well… here,” he said one morning, holding up a glowing mana stone like a treat. “Wanna see this one? Just came in. Purple vein—high purity.”

Didy sniffed it.

Then snorted and looked away.

Frederick was wounded. “She’s got better taste than half the merchants I deal with.”

---

Cecil took longer.

At first, his eyes remained sharp whenever the beast was near. His hand hovered near the hilt of his sword. But over time, something softened.

It began during territory inspections, when he brought her along for tracking. She kept pace with the horses, alert and soundless. She found tracks no scout had noticed. She warned them of bandits before they were even close.

Then came the hunts.

Didy didn’t attack.

She watched.

She protected.

Cecil noticed.

And one morning, Mer caught sight of them in the woods—Cecil walking with Didy at his side, the leash slack, her twin tails brushing the leaves behind them like they belonged there.

That night, she sulked.

“She likes you more than me.”

Cecil raised an eyebrow. “She obeys you.”

“That’s not the same.”

He laughed and pulled her close. “You’re the one who saved her.”

Mer muttered, “Still.”

Didy rested at the foot of their bed that night.

And though she was born from flame and darkness, she was now a quiet part of their days.

Not feared.

Not hunted.

Home.

---

Chapter: The First Layer

Winter was coming—and with it, the migrations.

From the western woods and the frost-split valleys in the north, monsters began to move. Drawn by instinct, hunger, or ancient patterns no scholar could quite map, they crept closer to the settlements—lurking just beyond the forests, their eyes glowing in the dark.

The knights of Ravenrow stood watch at the borders, patrolling in rotations. Sometimes, the monsters didn’t attack—they just watched, staying just beyond arrow range, gauging the strength of the defenses, waiting for the gap.

The tension never eased. Every day was a hunt. Every night, a test.

Cecil took to patrolling daily, often gone for days at a time. He led the vanguard, riding out with his trusted few—and always with Didy, her twin tails now swaying calmly at his side, her nose twitching at danger before it could be seen.

Mer watched him go.

Then turned to her desk.

She opened a notebook, the pages already cluttered with notes, sketches, and fragments of memory. She began to write again—designing a barrier, one she’d seen before, in a world that may not have existed.

A sphere, she thought. A true dome. Not one that only hovered above—but one that protected beneath the land as well. A hollow warding, wrapped entirely around the heart of Ravenrow.

She had seen it before—in dreams. She could remember the feel of the circle. The way the mana stones pulsed with golden threads. The calculations poured from her hands like breath. She didn’t question it anymore. Whether it was from another life or another version of herself no longer mattered.

This world needed it. Cecil needed it.

She scribbled coordinate points, measured energy curves, calculated range decay, and identified five locations to act as anchor points.

They had the mana stones already—clean and potent, thanks to Frederick’s ongoing rehabilitation system. But instead of burying them like before, she designed monuments—tall, stone structures that could be maintained and protected more easily, each with a carved cradle to hold a group of stones.

When she presented the plan, Cecil didn’t argue.

He only tightened his scarf, took the coordinates she handed him, and personally went with the stonecrafters to oversee the first monument’s construction.

Mer didn’t waste time.

She began the enchantments—each mana stone carefully tuned, inscribed with layers of her own signature. The magic was exhausting. Her focus had to be precise. Her magic had to bind without instability.

And slowly, the veins beneath her skin began to darken.

Rox warned her. Sarah begged her to rest.

Even Cecil—exhausted from patrols and dusted in frost—stood in the doorway one evening and whispered, “Please. Just stop for a night.”

But she couldn’t.

Not yet.

By the end of the month, as snow blanketed the kingdom and the cold bit deep into stone and bone alike, the five monuments were complete—each towering like silent sentinels. One hundred and seventy-seven mana stones, imbued with the highest quality energy, lay ready.