I Discovered I Was the Zombie Boss at the End of the World

Discovering I'm the Zombie Boss in the Apocalypse

(Apocalypse + Romance + Combat pet + Multiple elemental abilities + Immortality + Decisive and ruthless, not a do-gooder. The heroine is relatively weak early on, but becomes invincible later.)

When the apocalypse breaks out, the heroine comes down with a fever that won't let up. When she finally wakes,

she discovers that all her physical abilities have improved and she has become incredibly agile and nimble.

She thinks she has awakened an ability.

She diligently kills zombies and collects their cores.

But eventually, she discovers that she's a zombie herself.

No wonder killing zombies has been so easy, and they never attack her.

It turns out she's one of them!!

As the apocalypse wears on, they gradually uncover some hidden truths…