A Weak Space-Time Ability? What About Flying Thunder God, Kamui, and the Tremor-Tremor Fruit?

[Space-Time Ninjutsu + Space-Time Devil Fruits + Unbelievably Satisfying + Invincible] Zhang Feng transmigrates into a high-martial-arts world of supernatural abilities and awakens a space-time power from the start. Even though his ability is rated SSS, people still mock him, saying he can only work as a courier, a low-status support role. Fortunately, he awakens the [Complete Collection of Space-Time Skills from Myriad Worlds] System. By accumulating energy points, he can obtain every space- and time-related ability from across the myriad worlds. From the start, he gets the Flying Thunder God Technique. He unleashes ten consecutive Flying Thunder God slashes, terrifying the jokers and leaving everyone else awestruck. Slow-Slow Fruit: Reduces enemy speed. Op-Op Fruit: Cuts through anything and grants immortality. Tremor-Tremor Fruit: Shakes space, triggering earthquakes and tsunamis, and laying waste to the world! Kamui Sharingan: Phasing, twisting, and sucking things in, leaving the alien races dumbfounded! Impure World Reincarnation: A space-time summoning that crosses the boundary between life and death. Thousands upon thousands of ancient SSS-rank ability users serve me! With a laugh and a few words, one man wipes out a million members of the alien races.