Undead evolution system in a apocalypse

the world has changed, people now have powers but it's not all good. more than half of the world has now turned into undead territory where only those who have been infected now roam searching for the living to feast upon and spread themselves. and in this extraordinarily dangerous world I am a ordinary person who suffers from the Brunt of this new world's hierarchy But a certain incident caused me to change from being ordinary to something unordinary.