Warhammer: Wait, I'm the Second Emperor?

[Transmigration + System + Invincible Flow + Warhammer Memes + Father-Son Daily Life + Invincible Young Hero]

Waking up, I actually became Guilliman, the most miserable Primarch in the Warhammer universe!

At the start, an Eldar stabs me in the neck, Chaos Legions attack right in my face, and my own sons still cling to that broken Codex from ten thousand years ago.

Fortunately, I've got the "Strongest Regent System" and immediately fuse with the Viltrumite Regent! Stopping Thunderhawks barehanded, crossing the Warp in my physical body, one-punching each Chaos tin can!

Abaddon: "How could he possibly resurrect?!"

Tzeentch daemon: "He dragged me out of the Warp with his bare hands!!"

Ultramarines: "Father... why are you taking out your belt?!"

Guilliman grins: "Good, today Daddy will teach you what 'a father's love is like a mountain' means!"

Leading the Ultramarines to a full upgrade, empowered by smart atoms, every son becomes a little Superman!

Khorne's daemon army? Crushed! Nurgle's rot tide? Purified!

Tzeentch's schemes? Drag the real body out of the Warp barehanded and slap it in the face!

Slaanesh below, the Regent above!

Guilliman stomps the Eye of Terror to pieces, carries the heads of the Four Chaos Gods, and tosses them onto the Golden Throne: "Father, back then you didn't beat them hard enough or fast enough! This generation of Chaos-needs to be whipped with a belt!"