Rimuru The Yellow Primordial?

In the tense battle of the Tenma War, Feldway. The phantom king manages to get rid of Rimuru by throwing him into the end of space and time.

Rimuru, who is trapped in the vast sea of nothingness, He manages to escape and return to his original timeline with the help of his trustworthy partner and his manas, Ciel.

However, due to some miscalculations, Rimuru ended up in ancient time, but that's not all; he ended up reincarnating as the Yellow Primordial!?

I am not the author of "That time I got reincarnated as a slime(Tensura)" I'm just merely doing Fanfictions for fun.

Credit to the Original author, Fuse

Source material: Tensura(Ln&Wn)