Please, help to find a novel

Hi, I am looking for one novel since I read it a long time ago and forgot the title.

 Please help me find, I really need it!


 The cultivator goes back in time about 100 years ago, when he was 15-18 years old.  At this time, strange things begin to happen in the world, and wild animals begin to mutate and acquire wisdom, and because of this, there will be a disaster in the world.

 Later, the MC receives an inheritance or military equipment, sort of from a tiger in a cave.
 If I'm not mistaken, the tiger fought against a snake or a bear, and our MC then killed the tiger and took the cultivation technique on the wall in the tiger's cave.
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