I am the Barbarian King of the End Times

When the end of the world comes, most humans mutate into zombies, and creatures other than humans mutate into creatures that are even more terrifying than zombies.
Zhang Fan survived the apocalypse for two years and was suddenly reborn back to the day when the apocalypse began.
After some hard work, he gained supernatural powers with extremely strong growth potential.
[Obtained superpowers: Barbarian King, Active skill 1: Ignore all damage within five seconds of activating the skill; Passive: Physical fitness doubled (multiple equal to level)]
[Barbarian King: Level 1 (1/10) Current physical fitness doubled: 1]
[Note: Active skills can only be used once a day, and are refreshed at 00:00 every day. Unused abilities cannot be accumulated.]
"With such a powerful ability, if I am more cautious, I should be able to live a little longer..."
ps: Tags of the work: calm, cautious, not a saint, selfish, logical, very reasonable, highly intelligent, not a bootlicker, not stupid.

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