The Dungeon Lord used his head.

After waking up, it was time to get to work.

I got up, then I did some stretching and finally I lightly touched the Dungeon Core.

...

...

Nothing.

"What? Why is it not working anymore?"

Slap, slap, touch, touch, push, push, boing, boing.

No matter how pervert this sound, the Dungeon Core didn't react at all...

Maybe I need to punch it with everything I have again? No, that's too dangerous, and I doubt the one who created this would project it to work in such a way...

Think, think, there must be some clue.... what did it say when it was initializing....

"OH! THAT'S RIGHT! MANA SIGNATURE!!!"

Maybe I used mana unconsciously when I hit it before, thanks God it didn't break!

"Ok, now, how do we do this?"

I started to concentrate in my fist, slowly, imagine....

My chuunibyou side start acting and I mimicking one of the characters from my favorite fighting game.

"Gather ki from the air, and make a ball, gather ki from the air, and make a ball..."

And finally.

"Haaaaaaaaa!!!!!!!"

I pushed my theoretically energized palm on the Dungeon Core!

....

....

....

Fail!

Well, when I didn't see any light as I pushed my palm, I already knew something was wrong.

"Let's try again, this time, slowly!"

....

"Haaaaaa!!"

.....

"Haaaaaaaaaaaa!!"

.....

"HAAAAAAAAAAAAAAAAAAAA!!"

.....

"haaaaa....damn, this is not working at all, how the heck did I do it before!? Let's take a break and think again..."

Maybe its not like this... sigh... in those novels it always sounded so easy!

I sat with my back on the Dungeon Core and started trying to remember how I did it before...

Hmm, time to think again...Thinking....Thinking...Come on brain, help me out here....How was that?....

Last time, when I was absorbing mana, it all concentrated in my forehead...

Maybe touching my forehead on it will also work? This is the most idiot idea I ever had...

...

...

Well, it's not like I got anything to lose. Let's try!

[System login attempted]

[Verifying mana signature...]

[Avatar mana signature confirmed]

[Access Granted!]

[Welcome to Dungeon Management System]

[Please state your commands]

"Oh! It works!! Nice! Great, how do I use it?"

Great, let's start with the basics.

"System! Show me my options!"

...

...

Nothing...

"Come on! Please! Menu! Index! Dir!"

...

...

Nothing...

"Should I use my head again?" T_T

Taking no answer as yes, I touched my forehead in the Dungeon Core and asked again.

"System! Show me my options!"

[Understood!]

[Listing available features...Done!]

The message disappeared and soon after a list of features appeared.

-Summon

-Build and Modify

-Expansion

-Status

"All right, Summon!"

...

...

Ok, ok, forehead in the crystal, I know...

Damn, this is so embarrassing!

"Summon!"

[Accessing Summon Feature.]

[Access Granted!]

[Please state your command.]

"Give me the list of monster Summons."

[Understood!]

[Searching for monster summons...]

[4563478 results found!]

[Listing.]

[Listing..]

[Listing...]

[Listing....Done!]

A huge list of monsters appeared in the Dungeon Core.

The Dungeon Core was not big enough to show all monsters, so a scroll bar appeared on the side.

I tried using my hand to scroll the list but, as expected, it was not possible.

So, while cursing my luck and thanking that there was nobody else in the room, I put my forehead to use yet again.

[Beardless Gnome]

.bar..scroll scroll scroll...

[Goblin Assassin]

...scroll scroll scroll...

[Minotaur Princess]

...scroll scroll scroll...

[Blue Fairy]

...scroll scroll scroll...

[Classic Harpy]

...scroll scroll scroll...

[Blood Titan]

...scroll scroll scroll...

[Red Fairy]

...scroll scroll scroll...

[Earth Dragon]

...scroll scroll scroll...

"They should have ordered this list..."

...scroll scroll scroll...

[Yellow Fairy]

...scroll scroll scroll...

[Purple Fairy]

...scroll scroll scroll...

...scroll scroll scroll...

...scroll scroll scroll...

"I never thought I would miss my mouse so much..." T_T

[Understood!]

[Mouse]

[Rank: F]

[Diet: Omnivorous]

[Size: Small]

[Material for summon]

-Cheese, 1kg

-Mana, 5u

[Summon now?]

[Yes] [No]

"Hahaha... this system knows how to joke..." T_T