Sign-In: From the Start, I Have a Watermelon Knife, Invincible Across the Myriad Worlds

Synopsis: [Sign-in + Invincible + Comedy + the Myriad Worlds.]

Lin Fan transmigrates to a world ruled by immortals and demons.

Unexpectedly, he binds with the Myriad Worlds sign-in System.

First sign-in: He gets a watermelon knife, supposedly an unparalleled divine weapon once wielded by a mysterious expert, who used it to hack his way from the Southern Heavenly Gate to the Northern Heavenly Gate.

100 sign-ins: He gets the Six Paths of Reincarnation Fist.

1,000 sign-ins: He gets the Immortal-Slaying Sword Formation.

10,000 sign-ins: He gets the Chaos Treasure, Pangu's Axe.

100,000 sign-ins: He gets a small world inside his body.

Then, one day, countless powerful enemies come after him. A watermelon knife appears out of nowhere, and the whole world is stunned!