Although I don't have access to the System back in Arcadia through BNLO, I do have access to some of my Skills as Magic and some Abilities through my connection to my Avatar.
So, using that logic, perhaps it could be possible to manifest some of that power into the real world, somehow…
Similarly to Skills, the Territory System is also a manifestation of the powers gifted to me, and according to the Great Spirit, thanks to this connection with my Avatar, most of the powers I gain in Arcadia become "coded" within my soul.
This means that I could probably bring out some of the power of the Territory System, and officially transform my house and perhaps the surrounding neighborhood into my "Domain".
"So, how does this exactly work?" I wondered.
"Well, shouldn't you already know?" She asked.
We were already outside the house, sitting in my front garden. It was filled with all sorts of beautiful plants I had been growing with my daughter.
Using my magic, I've made them all into Spiritual Plants, belonging to my domain. I can control them at will, and the same is going on with my house.
Every wooden part of it has been assimilated and remade out of my own wood, so my house and my garden are an extension of my body, in a way.
"Should I?" I asked her. "You mean the Domain I create to fight?"
"Exactly." She nodded. "However, that one is usually a temporary domain, it disappears after a while because it is more like a buff-type spell. This time, we have to make it a permanent thing. And once it does, it won't ever be the same as the Domains you're used to."
"Let's begin right away, and then you'll learn once we do it. This time, I'm helping you do this because even with your current strength, you lack the knowledge of how to properly do this." She said.
"Didn't you say it was like a Domain?" I sighed, crossing my arms.
"I did… but it's different! Just believe me."
She quickly reached the floor, extending her body like countless roots down below. And then, through our connection, it felt as if we temporarily became one.
Waves of Spiritual Essence and Mana reached the ground, expanding into my house, the ground, the plants, and the nearby neighborhood.
Thankfully, my front yard had pretty big walls, and I had also enchanted them with Stealth Charms that make Mana emanated from her invisible to most people, at least non-awakened.
Slowly, I felt like my connection with her became so strong we became a single soul, our minds were connected, and it felt like it expanded.
My mind expanded alongside my soul, to the depths of the ground, and continued growing like an endless series of roots.
It continued expanding and expanding, much more than I imagined.
"We're lucky, nobody has claimed this whole place as their territory, so there are no disturbances in our flow of Spirit Essence and Mana. We might as well go as long as you can afford."
We continued doing this for several minutes… And it seemed like it took me a long while to finally reach my limit.
The Great Spirit was left dumbfounded.
"E-Even with my help this shouldn't be possible…" She was shocked. "Y-You covered almost a fourth of the whole city?!"
My limit was the end of the park twenty streets from here… I ended connecting with all the plants over there, stealthily beginning to transform them into spiritual plants.
"Phew, I wanted to cover the whole city! What a pity."
"Don't "what a pity" me! This is ridiculous! I… I am perplexed."
"Even you? Come on, let's move on to the next step. What do we do now?"
She then guided me into imbuing my Spiritual Power into the center of my house, while also taking a few materials out of my inventory.
Mainly Elemental Spirit Stones, and the many magic cores of monsters, alongside my sap, leaves, wood, and crystallized spiritual essence mined in the roots of my body in Arcadia.
These crystals had grown and developed rather recently, and were called Yggdrasil's Spirit Crystals, which grew out of my roots as a crystallization of the excess spirit and mana my true body held.
Once they started growing, they had to be mined so they wouldn't interrupt the flow of energy into the forest, there was a special mining team taking care of it, so I didn't have to worry.
"Now that the materials are assembled into the magic circle, stand in the middle." She told me.
"W-What are we going to do now?" I wondered.
"Hehe, we're making another Heart of the Forest, from scratch this time!" She smiled.
"Eh?! One in here? In the middle of a city?" I asked her. "Is that okay?"
"Don't worry about it! There won't be a big tree this time, this Heart of the Forest will be all the roots and plants you've connected to." She said.
"I-I see… Okay then!"
Without hesitating, I activated the Magic Circle we formed, connecting my body with all the materials.
The materials turned into particles of light and flew underground, fusing at the center that connected all the roots.
"Now, say it with me… {Domain Realization}!"
"{Domain Realization}!"
All the materials essence, my own energies, and the power of all the plants and roots connected together quickly crystalized right below my house, into a huge, green-colored crystal.
The house trembled for a little second, as a huge shockwave of Spiritual Essence erupted to all over the entire domain I had extended.
The entire world felt like it was covered by a thin, semi-transparent veil of pure Spirit Energy…
It felt like it was slightly distorting space itself, but not enough.
"W-What is this?!" I asked in shock.
"It's done." The Great Spirit rejoiced.
In that moment, I heard the Voice of the World…
[Congratulations, you have developed a Stage 1 Domain.]
[The Domain's Dimensional Membrane is currently weak, and perceptive to attacks.]
[Please feed the Domain with Essence and Materials to make it stronger.]