Magic System in a Parallel World

After clearing every monster they encountered on the 3rd floor until they reached the staircase, Leo finished one of his quests.

<You have completed a Quest>

[+10,000 Magic Experience, +50 Magic Points]

"I have finished the quest that requires me to kill monsters with magic. I also have enough Magic Points to increase my magic power. I'm going to do it before the boss room to increase my chances of killing it."

"Alright." Miss Camille nodded.

'Not only will my magic power spike again after this purchase, but my Magic Shop will also level up. I wonder what happens then. Will there be more purchase options?' Leo wondered to himself as he opened up the Magic Shop to purchase Increase Magic Power for 100 Magic Points.

<Confirm purchase 'Increase Magic Attack' for 100 Magic Points>

"Confirm."

Ding!

<You have purchased 'Increase Magic Attack' from the Magic Shop>

<Your Magic Power has greatly increased>

Ding!

<Magic Shop has leveled up>

<Magic Shop has been upgraded>

[Magic Shop]

[Awaken Random Affinity: 300 MP]

[Increase Mana Capacity: 3,000 MP]

[Increase Magic Power: 5,000 MP]

[Improve Magic Affinity: ?]

[Increase Mana Regeneration: 20 MP]

[Acquire Random F-Rank Passive Skill: 100 MP]

[Acquire Random E-Rank Passive Skill: 500 MP]

[Acquire Random D-Rank Passive Skill: 1,000 MP]

[Total MP: 21]

[Shop Experience: 70/20,000]

'Oh? Increase mana regeneration and passive skills? This Magic System is getting more and more interesting!' Leo thought to himself after seeing the upgrades the Magic System had provided the Magic Shop.

'And since I have 21 Magic Points left, I might as well increase my mana regeneration as well.'

<Confirm purchase 'Increase Mana Regeneration' for 20 Magic Points>

<You have purchased 'Increase Mana Regeneration' from the Magic Shop>

<Your Mana Regeneration has increased to 5>

[Mana Regeneration: Recovers mana every second]

'Does this mean I will recover 5 mana every second?! This is amazing! Although it's not as powerful as Miss Camille's S-Rank artifact, I'm sure it'll eventually reach that point and even surpass it!'

"Are you done yet?" Miss Camille asked him sometime later.

"Yes, I'm finished. Let's go." He nodded, and they proceeded to descend the narrow staircase until they reached the bottom of the labyrinth.

Unlike the first three floors of the labyrinth, there was no forest on the fourth floor.

The fourth floor appeared to be underground in some kind of cave, and there was a narrow path that led to a massive gate in the end.

This gate oozed with a dangerous aura that made it difficult for those with a weak mentality to approach.

"I'm guessing that's the boss room?" Leo asked the obvious.

And he continued, "What can I expect inside? A massive boss? Or will I be fighting a group of monsters?"

"It depends. You will fight one boss most of the time, but there will be times where you have to fight two— even three bosses at once."

"There's something else you should be aware of before you go inside. Once you enter a boss room, you will not be able to leave until you either defeat the boss and all of the monsters inside or use a teleport artifact, so it's literally do or die."

Leo swallowed nervously after learning about this information.

Although he wasn't worried at this moment because of Miss Camille's presence, he might not be able to feel the same way in the future when he has to enter labyrinths by himself.

"Alright, I'm ready to fight the boss." Leo said after taking a moment to prepare himself.

As they approached the menacing doors, Leo could feel the ominous aura wrapping around his body, making him feel even more uncomfortable, and it felt like he was being watched.

Once they were before the doors, Leo pushed it open just slightly enough for them to walk through.

The moment Leo and Miss Camille walked through the doors, it slammed shut behind them, startling Leo for a moment.

"T-This is the boss room?" Leo was amazed by the scenery before him.

He had expected the boss room to be similar to boss rooms in video games, which mostly consists of enclosed rooms where there's very little space to run.

However, this boss room before him was the complete opposite.

The room was anything but small, and it was so vast that Leo could not see the end.

"Are you sure this is the boss room? It looks just like the first floor." Leo said in a dumbfounded voice.

"Just wait." Miss Camille said.

Literally seconds after she said those words, Leo could see the scenery change right before his eyes.

The green trees were withering at such a rapid speed that he could see them turning green to brown within seconds. Once the trees were withered, Leo could see a big shadow descending from the sky, landing in the middle of the room.

The moment this entity landed in the middle of the room, all of the withered trees began to burn, turning the room into a sea of fire.

Leo's eyes widened as he stared at this entity that resembled a butterfly, but it had a pair of flaming wings.

The butterfly was about 10 meters tall, and every time it flapped its wings, fire balls would fly all over the place.

"Are you sure this is an E-Rank labyrinth?! This monster looks incredibly threatening and powerful! And it's freaking huge!" Leo exclaimed a moment later.

"That's a Fiery Butterfly, a D-Rank monster, but it's been enhanced with gargantuan. All boss monsters are stronger than normal monsters because they all have what we call 'modifiers', something that empowers them, making them somewhat unique monsters. Gargantuan is a modifier that increases the monster's size and overall strength. It's one of the more powerful modifiers out there. However, this makes it a lot easier to hit them, so as long as you can avoid its attacks, you will be fine."

Leo stared at the Fiery Butterfly with narrowed eyes. After taking a deep breath, he cast Void Spear and started to overcharge it.