Gilgamesh in DxD

Gilgamesh was training Leonardo to be able to create stronger creatures with greater speed.

Leonardo had great talent with his Longinus, while still with the Heroes Faction the creatures he was able to create were at the level of middle class demons.

But even with this level of power they didn't have much combat power, so Gilgamesh was teaching Leonardo to give his creatures more skills and techniques.

Leonardo was also training with his Sacred Gear [Night Reflection] that Gilgamesh gave him, and he had more practice with this Sacred Gear because it was very easy to mold and manipulate, so Leonardo used this Sacred Gear in a form of protection with the shadows.

But even though Leonardo had great mastery over his Longinus there were still limitations.

[Annihilation Maker]. One of the first four Longinus. It said that every Longinus possesses the power to kill the Gods, a being that is praised and worshipped by mankind, they are entities that are said to be peerless. And it was not wrong, every Longinus really does possess a power capable of destroying the World.

But there is one problem, you user. No matter what, so far there is no proof that humanity is able to use this power, even if it possesses it. It is because all of them, for the most part, are too weak, their bodies too frail despite possessing so much power, and such a thing is no secret to the world.

Before Gilgamesh there was never a report of a Longinus user being able to defeat and kill a God or creatures of that level using the power of Sacred Gear. User of [Boosted Gear] in the record of history was only able to defeat Ultimate level monster, without using Juggernaut Drive, of course.

However, there are few Longinus that are different.

They may be equal to other Longinus, they have power to kill Gods, but they are limited due to their Humanity status. However, those Longinus so different are not.

Not because of their user, but because of their power.

[Zenith Tempest] also known as the Prison of the Brilliant Celestial Thunder. It has the ability to control the weather and its elemental attributes. With such power, even in the hands of an amateur, one can drown an entire city or a small island by making it rain endlessly. Creating a winter in the middle of a desert is not even impossible, in fact you could say it's easy. The user is even able to make an endless storm that is capable of advancing madly through the countryside and destroying the island without a trace.

[Dimension Lost], also known as Extinction Mist. For simplicity, calling the mist a black hole will be understandable. It doesn't block, it doesn't attack, it eats. Everything that touched it absorbed it, swallowed it whole, and sent it into the Dimensional Gap, a place that exists because it exists, a gap between realms. There, there is nothing but nothing (no pun intended, of course), it is an empty, hollow place, a place that is filled with untamed essences and remnants of unknown energy that will crush anything and try to digest it the moment something enters. You can destroy an entire island by engulfing it in that mist and sending it to that place.

And then, [Annihilation Maker].

Ability to create creatures based on the user's imagination. One who Leonardo possesses, ability to create any creature based solely on his imagination. The thought of such a power existing is really quite frightening. Without care, one can create a giant monster the size of a mountain running wildly in the middle of a city.

However, no matter what, but the limitation is there. Although terrifying, but its main source of power is also its greatest weakness.

Imagination, no matter what will not be capable in comparison with harsh reality.

For example, you try to create a creature that you thought would be unbeatable. But what is the limit? You can't create energy just based on that, because the world doesn't allow it, natural energy and mana in the air can't be manipulated that way. Imagination is a powerful weapon, you can create a high medium or high demon level monster army, but that's it. To reach the creature beyond that, you can't just use your imagination.

You have to understand something, how it works, what limits it, what strengthens it, how it lives, and what keeps it alive. The last one is the biggest problem for [Annihilation Maker]. Because they just create things incorrectly, the things they create suck into them, using them as a source of power and become their limitation.

Although Leonardo currently had the ability to create creatures with the power compared to the middle class of demons Gilgamesh's training was helping him evolve to be able to create monster capable of defeating upper class demons.

Leonardo quickly held out his hand and the shadows around him rose until they took the form of large creatures, larger than Gilgamesh and began to advance, each of them were using swords created from shadows of [Night Reflection].

Gilgamesh smiled as he watched Leonardo mix the power of his Sacred Gears, the portals around Gilgamesh released several swords launching against Leonardo's monsters.

The monsters used their shadow swords to dodge Gilgamesh's first weapons however soon three other weapons took their places totally destroying Leonardo's creatures.

"I think that's enough for today" said Gilgamesh making Leonardo smile tiredly before falling to the ground panting.

In order for Leonardo to create his creatures he expended his physical and mental stamina, the stronger they were the more he would expend of stamina.

"That was... tiring" Leonardo said as he gasped.

"Yes, but you are doing very well, I am proud" Gilgamesh said smiling slightly causing Leonardo to smile

Since he started to be part of Gilgamesh's group his life has totally changed because now he really had a family.

Leonardo had gotten used to everyone and everyone had been nice to him, from Mordred to Karna, everyone had treated him like he was really part of the family.

Leonardo even saw Gilgamesh as an older brother, someone he wanted to become like in the future.

"Will you summon more servants?" asked Leonardo to Gilgamesh.

Since he was in Gilgamesh's group the King of Heroes explained to him about the servants and the origin of Enkidu, Mordred, Arturia and Karna.

Leonardo can't help but be surprised by this, the ability to summon the heroes of the past to help him was surely an ability Cao Cao would kill to have.

"Yes" said Gilgamesh to answer Leonardo's question.

Gilgamesh still had two summoning cards saved up from before he summoned Arturia, he had earned these a long time ago but he didn't want to use them because there were things he had to sort out first and he had no idea who to summon.

"Well come on" said Gilgamesh as he approached Leonardo so he could heal the boy and return to the house.