Name of the song in episode 115 and 116

[Ashgarn1]

Hi everyone, i can't find a song in Black Clover, you can hear it in episode 115, at 15:56, and episode 116 at 12:58.
It's kinda "dark" song.
I searched, searched and searched but i found nothing
So i hope you'll know the name of the song.
Thanks !