Dungeon Battle Royale ~ Since I became a Demon King, I will aim for World Domination

Chapter 300 – A Demon King’s Book of Secrets

“Shion-san, what mischief are you scheming this time?” Kanon asks me.

“Mischief…that’s slander, you know?” I answer while diligently getting everything ready. “First off, Tomio…was it? I’ll give that guy a 『Big Black Iron Ax』.”

“Oohhh…a free gift from you? This is definitely going to have a catch.”

“Just what kind of image do you have of me?”

“Demon King.”

“…Well, that’s what I am, no? Anyway, I’ll give him an ax and strengthen him…leading him to believe that there are treasures inside treasure chests.

“Treasures inside treasure chests…? Isn’t that only natural?”

“It is, but this is just to make sure. For the time being, I suppose I’ll take a look at Tomio’s situation.”

Once I check his progress on my smartphone, he’s advanced close to the location of the fake chest I had installed earlier.

“Hmm? Gii, gii, gii!”

As soon as he discovers the chest, he calls out to the goblins with him in Goblin, and they begin to cautiously surround the chest…then he slowly opens the lid with the tip of his crude sword.

“T-T-Thiiiis iiiisssss!”

Tomio holds up the ax he’s retrieved from the chest and begins to dance in joy with the goblins and kobolds around him.

Oohhh…he’s happy, so happy. And once you obtain a new weapon, you want to test it out, right?

Without losing a moment, I send newly created low-level goblins and slimes to defend, continuing to observe thereafter.

“Hmm? Fresh troops!? Gii! Gii!”

Once Tomio tells his goblins something, they step back, allowing Tomio to face the new arrivals with his new ax at the ready.

“Now’s the time for me to show you the result of my training!! Here I cooooooome!”

With rough nasal breathing, Tomio faces the goblins and slimes, starting to overwhelm them with his newly obtained weapon.

Oohhh, how strong, so strong. Even though he’s brain-damaged, he’s still a Demon King.

As I watch the excited Tomio…

“Shion-sama, it is done. Will this do?”

Mrs. Tamura carries over what I had requested from her earlier.

“Oh, that looks pretty decent! Hmm. Oh, please add 『Strongest Demon King』 here as postscript.”

“As you wish.”

Mrs. Tamura writes with a brush the extra line on the item I had requested from her ―― Japanese paper.

“Oh, niiice!”

“What are you making Masako-sensei write?”

“A Demon King’s Book of Secrets.”

“A Demon King’s Book of Secrets?” Kanon peers at the paper while tilting her head in confusion.

“T-This is…!?”

Kanon is shocked after seeing what’s written there.

『

Demon Kings can evolve into following races after reaching level 3:

Demon King (Human) ← Recommended☆ You might become the strongest one day.

Initial race. Has no traits. A race with infinite potential as it can choose its evolution path each time it levels up. Evolution conditions: none.

Demon King (Ogre)

A Demon King driven by an urge of destruction. They excel in physical strength. Magic is their weak point. They can create new ogre subordinates. Evolution conditions: Body C or above.

Demon King (Devil)

A Demon King who can obtain any kind of ability depending on the chosen evolution path. They can create new devil subordinates. Evolution conditions: Mana C or above.

Demon King (Elf)

A Demon King reigning over the forest as sage and guardian. They seek Knowledge and excel in Mana. On the other hand, their toughness is questionable at best. They can create new elf subordinates. Evolution conditions: Knowledge C or above.

Demon King (Dwarf)

A Demon King who can alchemize everything. They excel in Alchemy and are very tough. They can create new dwarf subordinates. Evolution conditions: Alchemy C or above.

Demon King (Slime)

A Demon King whose great talents mature late. They will evolve often without ever keeping a certain shape. They excel toughness. They can create new slime subordinates. Evolution conditions: Create more than 100 slimes.

Demon King (Beast)

A Demon King releasing their instincts by transforming into a beast. They excel in agility, but are weak at magic. They can create new beast subordinates. Evolution conditions: Create more than 100 beasts.

Demon King (Fairy)

A Demon King endowed with the perfect abilities to live together with nature. They can create new fairy subordinates. Evolution conditions: Create more than 100 fairies.

Demon King (Vampire)

A Demon King endowed with the aptitude to survive in darkness. They exhibit their might within darkness. They can create new vampire subordinates. Evolution conditions: Don’t move from your room and avoid light for more than 30 days.

Demon King (Dragon) ← Recommended☆ But, can you become one?

The strongest Demon King. A Demon King who believed in their own potential, overcame all ordeals, and succeeded in ruling over everything. They can create new dragon subordinates. Evolution conditions: Kill more than 100 monsters without relying on your subordinates.

Demon King (Fallen Angel)

A fallen angel who has become a Demon King to get revenge. They can create new fallen angel subordinates. Evolution conditions: Kill more than 100 humans without relying on your subordinates.

』

“What are these 『Recommended☆』? Also, the descriptions of all races are slightly different from what I know.”

“As for the descriptions, I instructed Mrs. Tamura to write down while recalling what I had heard before, but…well, it’ll do. 『Recommended☆』 is something that Mastermind would use, don’t you think?”

“Ohh…given the 『Special Service☆』, it’s quite plausible. So, you’re going to give this to Tomio?”

“He’d be suspicious if he received it out of my hand, so I’ll give it to him by putting it into a treasure chest.”

“I see! In other words, you’re going to make him your subordinate after he becomes a Dragon Demon King, right?”

“It’d be great if all goes smoothly, but…I suppose that’s the aim here.”

All that’s left is to send in goblins or some such with serious killing intent. The ruler of this world ― the Mastermind ― doesn’t like backdoor tricks like exploiting holes in the system. If it’s subordinates I ordered to get defeated, it’s possible that it wouldn’t be counted.

“Well then, let’s believe all will go well and prepare the 『Demon King’s Book of Secrets』.”

I had the fake box with the 『Demon King’s Book of Secrets』 installed on the path Tomio would take during his invasion.