Piano song when Golgius tries to takes Meliodas' sword in episode 5 In Nanatsu no Taizai, there's an ominous piano soundtrack that plays in season 1 episode 5 when Golgius tries to takes Meliodas's sword. It plays again in season 1 episode 15 when Guila kills the kids bullying zeal. And in Season 2 it plays in episode 5 when Galan pulverizes Meliodas's.

What is the name of this song?
I looked through the entire OST and couldn't find the song played there.
I think that track might be too simple and short to be included in the OST.

1 hour soundtrack:
Youtube 
Playlist of the soundtrack 
Youtube

But maybe I missed something.