Doomsday Descends: I Have an Army of Shadows

[Semi-invincible + not reborn + light System elements + zombies throughout + multiple heroines + no romance plot + heroines are unimportant + use them and toss them aside]

Nothing much to say. He starts with the Shadow Troop, while the System (Main God) guides the main world into a zombie apocalypse. Players compete across the main world and the Myriad Worlds (crossed out), but the protagonist stands head and shoulders above everyone else. Later, the zombies (Main God) invade the Myriad Worlds, and the Shadow Kingdom devours them.

Worlds of the Heavens:

Ideas already in mind (written or definitely planned): the world of Valandia (a version of Calradia reimagined through the author’s mod ideas), zombie Marvel (films), zombie Armor Hero (mainly Armor Hero 2, with 1 and 3 as supporting stories), zombie One-Punch Man (anime), and Game of Thrones.

Planned (wishful thinking): Warcraft I (film), Naruto, One Piece, Demon Slayer, Akame ga Kill, Type-Moon (more will be added later)...

Might write: Jackie Chan Adventures, DC, Alien and Predator, Bleach, The Legend of Qin, and Valandia (still can’t let it go).

The protagonist’s cheat: the Shadow Troop is a heavily modified version (strengthened and improved), and the Shadow Kingdom is a dimensional world (greatly strengthened and improved). (Don’t argue; the author’s imagination is the final word.)