25 Chapter 25: Leaving The Party and A Teleportation Bunker

After returning from there trip, Mournomon started fixing the defenses of the mansion which were in place but never activated. He changed some of the runes that made up the defensive formations, it did little to improve the strength of the defenses but that was not what he was focussing on.

The strength of the defenses was good enough since it was a formation set up to protect one of the largest clans in the underworld, but Mournomon had a problem with the amount of energy the defenses used and how they were repaired. He decided to change it a bit so that the formations not only used the mana in the air to keep it activated but also to have an automated preparation system inside. This way not only would it cost nothing to have the defenses activated but they would also repair themself if damaged, the only problem is that only he would be able to work on the formations from now on, but he didn't think too much of it since it didn't seem that they will ever want to change the formation seeing as they didn't even use it before he worked on it.

The whole job took him about seven months since he had to go through thousands of different runes and glyphs within the formation to find the right ones and there were more than a hundred formations interwoven to create the defensive formation that the Sitri house has. Not to mention all the fail safe's that were put in if one of the formations were to be broken, to ensure that it wouldn't interfere with the other formations.

...

After finishing with the defenses of the Mansion and the surrounding territory Mournomon decided to spend his free time in the garden. Over two years have passed just like that, within this time Lady Gremory and Lady Sitri had visited each other a few more times, little Sona and little Rias have become close, the two would always play in the garden at the Sitri's mansion when the Lady Gremory came to visit and brought Rias along.

Mournomon would keep an eye on them while tending to the garden, making sure they don't hurt themselves or the plants, there had been several times he had scolded them for destroying some turns.

...

This day was not like any other, it was the day Sona became five years old. Mournomon woke up early and freshened up before helping with the decorations for little Sona's party. Serafall also came and one would swear it was her party by how happy she was.

After finishing, everyone got ready and waited for Sona to wake up, they did not have to wait long before they heard footsteps as a maid lead Sona and Rias to the dining room where they had set everything up.

The door's opened and everybody yelled "Happy Birthday SONA!!!", Sona who was still half asleep was immediately shocked awake, her face bloomed with a beautiful smile as everybody went up to congratulate her.

As everyone was going forward to congratulate her, Mournomon smiled as he placed a small wrapped box on the table with Sona's name on it before leaving without anybody noticing. Although he wanted to leave later that night he decided it was best he left now thought Sona might hate him for it he had lived with the Sitri's far longer than he planned and he might live here even longer if he didn't leave now.

...

Moving through the forest the Sitri Mansion was quickly growing smaller until it disappeared completely and even than he didn't stop moving. The further he moved the more he wanted to turn back. "I've grown soft", Mournomon thought to himself, he had killed less and fewer devils the longer he lived with the Sitri to the point he would even capture some alive.

After a few more minutes he stopped, his body slowly morphed back into his original form, Alex. Stretching somewhat Alex looked around for a bit until he found a hidden cave, walking inside he found the cave empty before placing a few extra concealment formations at the entrance just to be safe after he walked until he was in the deepest part of the cave. The cave wasn't big but he could stand upright in it, looking around he tapped his foot on the ground and the cave started transforming, the deepest part of the cave expanded until it was around four meters in diameter, the rough ceiling walls and floor of the cave became smooth as if it was cut and carved by a sculptor. A perfect circular room was now at the deepest part of the cave.

Satisfied Alex fixed a few defensive formations at the entrance to the room, he didn't want anyone to be able to breach the room. Finishing with the formations Alex place his hand in the middle of the room, "PRAEMOENIO(Fortify)" he chanted as the earth elements started gathering on the rocks that made out the circular room and strengthening it. With that done he pulled two four seeds from his inventory and placed them at the edge of the room equally spaced from each other and dripping a drop of his blood on each. The seeds quickly sprouted and became small trees.

The trees were known as treants, if grown using a spellcaster's blood they will follow only that specific spellcaster's orders. Treant's strength comes from what energy they are given while growing, so although these treants he made are small their strength is nothing to ignore as they were created from the blood of an ancient titan, even if it was just a drop.

Having finished the defenses, Alex started to make a teleportation circle in the middle of the room, the process was quite easy now that he knew how to make one and the circle was finished in no time.

"Time to leave", he thought

Alex stepped into the circle and with a blinding light, he disappeared.