I forgot, which was bug fable? Was that Fable from paradise?

I believe that's the fable he got at the beginning when he crushed the bug on the train that had eggs.

It's the fable he got from killing that demon in the trial in the demon castle. (๑•ㅂ•)و✧

Its the fable he got form killing the demon in the dark castle it makes him stronger when the enemy is weaker to him in fable wise power