There was some logic about how a strong body would also mean a strong soul or smth

If the body was strong, why won't the soul also be strong

If not, how would it managed to utilize the strong body or smth

I don't remember the troupe so uh yeah, funny body nutures the soul to grow

If Saitama we’re going up against someone who could destroy his life force/soul, he would probably have to have enough raw power to have any chance of winning. For me, the soul is not a metaphysical part of a person that lives on when they die. Both body and soul can be destroyed.

I see him like Superman, where Superman is very vulnerable to Magic aside from Green Kryptonite.

He can only One Punch anyone or anything in his Verse.

I say he'll perhaps die

He will resist it. His ability is basically some kind of exponential evolution based on who he is fighting against. With this ability, he was able to brute force through a spiritual plane, so it stands to reason that he can not only defend against soul based attacks, but also attack souls that otherwise could not be harmed, if he wished to.

@Doodlewuzhere91 show me where he brute force through a spiritual plane

Chapter 102, he breaks into the "Phoenix Plane" by "knocking on it until ot opened"

Later in the series, he is also able to touch and interact with hyperspace portals, which are supposed to be intangible, solidifying the idea that he can interact with anything be wishes to interact with.

Doesn't he have Emotion Empowerment just only for traits physical or whatever so he could survive it a I guess

His insane fighting spirit and willpower would protect him, just like it did against Tatsumaki's psionic powers.

Maybe it could hurt him since he's physically unbeatable.