I Write Absolute Prohibitions in the Last Days

Zombies besieged the city and order collapsed. In a desperate situation, I discovered that as long as I wrote the rules on paper with my own blood, they would become an absolute law that cannot be broken. A wave of corpses is coming? I wrote: [100 meters ahead, the dead are prohibited from entering]. Relying on this blood pen, I carved out an absolutely safe pure land in the apocalypse. But the price tag on the power of words is my memory. Until one day, I stood on a high wall, looking at the hundreds of millions of monsters surrendering under my feet, but I looked down at my bloody hands—— "Who am I?"