This World Is Modified I Suggest for you to use Mods/Shader/Optifine/ResourcePack If You Like To Get Full Experience from this world
i used cursed seed name [Relentlous] after that i just modified world to even better version

You should use this shaderpack and resourcepack link is above

Shader https://www.mediafire.com/file/dj7zx8a8q1yj6wy/JavaEdition_Shader-FaityLife_%281.12.2%29.zip/file

ResourcePack https://www.mediafire.com/file/ibvt248tjsgee0e/JavaEdition-HD.zip/file

FaityLife World Mods Can Be found In Resourcepack Folder Its Recomended to use those mods to avoid issues/Errors

If You Have question Or Something dosent work Tell me in the comment section and i will answer soon as possible
averge response time is 1 - 20 days

Game Version is 1.12.2

Recomended:
Best Video Card To Run Shaders: Of Course Shaders is Optional
Gaming PC To Avoid Lag