"Of course," Tsuna replied. "But before that, I'll need to set access permissions. I'll need a bit of your blood to define who can enter the Training Spaces."
"Oh~ I see. To keep outsiders from wandering in, huh?"
Loki caught on immediately.
Not that she thought anyone would sneak into her home and stumble across Tsuna's secret facilities—but still, better safe than sorry.
Glancing at Astraea, who hadn't quite caught up to the conversation yet, Loki smirked. "Perfect timing. Astraea's here too—why not take her blood as well? Her kids will be joining the sessions anyway. Saves us the trouble of letting them get locked out later."
Tsuna nodded slightly. Two small knives floated up before the goddesses.
Loki didn't even blink—she was used to seeing him do this kind of thing. Astraea, on the other hand, looked genuinely startled.
Still, both took the knives and made a small cut across their fingers.
Fresh blood welled up from the wounds and hovered in midair, held aloft by invisible force. The crimson droplets from both goddesses merged together, twisting with some unknown energy until they expanded and solidified—forming two doors.
Etched upon each door were the crests of the Loki Familia and the Astraea Familia. The mark of divine authority—the boundary between two halls.
"The red door leads to the Challenge Space," Tsuna explained, pushing it open.
Inside lay a world completely different from the room they stood in.
"Just like I said, this space is modeled after the Large Tree Labyrinth."
Astraea's eyes widened at the sight.
It was the first time she'd ever witnessed such an ability. A child creating an entire dimension before her eyes—not with magic, but with a skill.
That realization left her speechless.
What kind of skill could possibly do this?
"Ohh~" Loki whistled softly, peering through the doorway. "This looks different from the plains and forests in the resting area. The trees here grow along the canyon walls—it's wild, chaotic. I like it."
"And there's a pretty big river running through it too. You could really pack a ton of dangerous monsters in here. The terrain's complex, perfect for live combat."
"No, Loki. That's exactly why it's not suitable for combat."
Astraea, who had been quietly analyzing the terrain, shook her head.
"As a canyon, the slopes are far too steep. Fighting here would drain stamina at an alarming rate."
"And that river? It's a natural hazard. Life always gathers near water. Any adventurer who gets too close will just attract more trouble."
"Since this space is for facing their weaknesses, I assume you didn't fill it with simple monsters?"
"Exactly, Goddess Astraea."
Tsuna snapped his fingers.
The ground trembled as three massive, serpentine creatures slithered out from the canyon floor.
"The mutated Floor Boss from the Great Falls—Amphisbaena."
"Since we skipped that boss during the last Expedition, I didn't get to study it directly. So I rebuilt it using the Guild's intel and added a regeneration trait similar to the mutant Goliath. Power level: roughly Lv.6."
"In addition, I've also included the Juggernaut your girls encountered in the Large Tree Labyrinth."
The purple-black, emaciated reptile crawled up from underground, its four limbs pressing into the earth as it rose before them.
"It's part of the Dungeon's cleaning system," Tsuna said calmly. "Its body is made entirely of purple-black Magic Stones, giving it extreme durability. Even first-tier weapons can't deal fatal damage."
"Worse, it reflects magic attacks with multiplied power. Only close-combat fighters can take it down—any mage who tries would risk wiping out their whole party."
He paused, then added, "Its strength fluctuates depending on the floor it appears on. Around the 30th floor, that'd put it at roughly Lv.5."
Astraea finally understood.
No wonder her children had been pushed to the brink of annihilation. Against such specialized monsters, any unprepared adventurer would have been doomed.
"This is the Challenge Space," Tsuna said. "Beating the monsters here won't grant any Excellia, but the experience gained from these fights is worth more than any stat increase."
Loki and Astraea exchanged a look and nodded.
"Yeah," Loki said, grinning. "That kind of experience is way more valuable than raw Excellia."
"Agreed," Astraea added. "They might not gain levels here, but facing monsters that specifically target their weaknesses will teach them how to respond in real battle."
"An adventurer's fight," Tsuna said, "isn't just strength—it's information warfare."
"Knowing a monster's habits in advance makes all the difference. Every creature in the Dungeon has a weakness. The problem is, the Dungeon never gives adventurers time to discover it."
"But this space changes that."
Astraea could only marvel.
Such an ability—it was terrifying in its potential. It could accelerate an entire Familia's growth beyond normal limits.
Since Tsuna could create both the environment and the monsters, he could perfectly control the difficulty of each challenge—eliminating the risk of fatal accidents.
That was the Loki Familia's greatest advantage. No other Familia could dream of having something like this.
And over time, that advantage would only grow larger.
Just like the age of Zeus and Hera, Astraea thought.
When Heroes stood at the center of the world, and everyone around them grew stronger in their light.
Under a Hero's guidance, others took up their weapons and rose to face the crises that threatened the world.
At that moment, Astraea believed more than ever—
The Age of Heroes would return.
And this time, it would shine brighter than ever before.
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Note: Sorry for wrong chapter😭