Fey couldn't help but tear up when she heard him say this. She could really feel Fein's care for her in both his words and actions. Ever since they were a child, her brother would always tease her and he always ignored their mother. But now, he finally became a reliable brother, a person that she could look up to!

Fein smiled at this. He could feel an inexplicably fluffy feeling in his heart. Although it's a bit embarrassing for a man like him to think like this, he just couldn't help it! 'This is probably the power of family?' he chuckled as he remembered as certain meme in his past life.

"Can we continue our spar? I still have some abilities that I didn't use." Fey took a deep breath.

'Yeah, you still have three that you didn't use,' Fein complained.

Although, his sister's ability could help her escape the most dangerous situations she might encounter in the future. There's still something that could counter this like his 'Dragon Abyssal Death Blade'. Specifically, his sword's 'Killer of Concept' passive ability, that let it attack anything! It specifically targets those untouchable existence and incorporeal things, such as conceptual beings. So, if he used his sword with their sparring just now, Fey's ability would become useless. After all, he could just hack him to death even if she entered her intangible state!

'I really have to teach her not to rely on her phasing ability too much,' Fein concluded.

Fein knew that abilities or items that could target intangible thing are very rare, it doesn't eliminate the fact that it exists. Low possibility doesn't mean zero! He hates fluke mentality so much, that's why he always seeks assurance for everything he does. So he decided that he would improve Fey's all-around aspects, not just her ability.

"No problem," He responded.

DING!

[Phasing Punch- It lets the user throw a punch in his intangible state. It has a one hundred percent hit rate! Can only be used thrice a day.]

BOOM!

Before Fein could even react to the sudden beeping of his system on his head. He felt a solid force smashed his head, which made him dizzy.

Fey looked at her fist with incredulity as it sent her brother flying. She just thought of the ability, and she didn't how, but her fist had already arrived at her brother's left cheek in the blink of an eye!

Fein stood up because he suppressed his body strength at his sister's level. He could feel his left cheek where the attack landed itch.

'That's a fucking causal ability!' Fein didn't believe in evil.

So he called out Fey's ability description the system provided him for the second time. And he didn't see it wrong, it's really a causal ability! his sister had a causal ability!historical

What does being able to punch in an intangible state mean? It means she can attack while she's invulnerable.! It means her enemy can't hurt her, but she could punch the enemy, and her punch would have a one hundred percent hit rate.! If that's not a causal ability, Fein doesn't know what is... After all, it's literally a cheat ability. Even if one teleported into hell, Fey's fist would still reach the target! What is a causal ability? They are abilities that can't be countered, canceled, and they always work a hundred percent all the time. Because causal abilities work with the laws of the world!

The only he found pity was, the damage only depends on the power of Fey's fist, and she could only use it thrice a day.

'Should I train her to become like Saitama?' Fein shuddered at as he imagined her sister's bald head. 'No... no... that's so fucking abominable!' He'd rather die than let that day to come!

'Is her phasing arrow also a causal ability?' Fein touched his chin. 'Damn, I didn't expect my sister would obtain a causal ability earlier than me. It seems her luck is a bit better than me.' He didn't really expect it, that such ability with a plain and boring name would turn out to be a causal one.

Fey ran to her brother's side with guilt, and when she saw him touching his chin in a daze, she became even more guilty. She still can't process what just happened.

"Ahmm... are you okay?"

Fein blinked as he heard his sister's voice. "Yeah, I'm okay. Did you understand what you just did?"

"I'm sorry." Fey stared at the ground.

"No, not that." Fein shook his head at the misunderstanding. "You have a causal ability." He look at his and his eyes became serious.

Fey look up and shifted her stare to Fein and asked, "Causal Ability??"

"Yes, Causal Ability lets you..."

Just like that, Fein explained his understanding of how causal ability works. And he also explained that Fey might have two. As Fey stated to understand what causal ability is all about, her surprise had reached the maximum limit.

"The one you used just now might be one of them, and I just used my appraisal ability and you have two abilities that you haven't used yet called 'Phasing Arrow' and 'Super Speed'. While the one you just used now is called 'Phasing Punch." Fein looked at his sister. "Do you understand?"

It took Fey a moment to process before she processed what her brother intended to say. "It means that 'Phasing Arrow' might be also a causal ability!?" she asked at her brother with astonishment.

"Yes, and you're lucky. I personally classified abilities into six levels: regular, special, legendary, mythical, causal, and god-level. Regular is the weakest while god-level is the strongest. Just by this, you can see that causal abilities is only one rank behind god-level abilities in terms of quality." Fein took a deep breath. "Personally, my highest ability is a mythical grade called 'Ghecko Substitution.' that lets me exchange position with almost anything."

Although the ranking he mentioned wasn't really his own, but the system's classification. But he owned the system, and it's only reasonable to say that he owned what it has. After all, his system is his ability!

HISSSS!

Fey took a deep breath as she learned just how special her causal ability was...