@elite3532 PLEASE READ ALL OF IT!!!
what if idea: Rimuru arrived too late to save his nation, but it wasn't completely destroyed, it just received more damage than the original timeline, after that, Rimuru began to hate humans, and he killed the Falmouth army more mercilessly, then he creates a new law prohibiting humans from entering his forest, generally he eventually lost hope in humanity, so he no longer wants a good relationship between them, he slowly cut his connect with other humans including nations like Plomond(since it is a human nation), or persons like Yuki and Mjollmile and even Hinata(she was responsible for the delay so he hate her and may kill her?), except for his students, because he still respect Shizue's last request(he consider her as a special exception)
-while he hates humans now his love for his people has increased, so now he will do whatever it takes or sacrifice anything for his people's comfort
-that it, I hope you consider applying this idea