Signs of holy war? What exactly is that? It seems a tad weird to me that meliodas would just kill a goddess. granted it tried to kill him but to me it looks like the goddess in question was mostly harmless. Well, maybe current mel wouldn't take issue with killing in cold blood but past mel is definitely not the type to do that.It's not in the manga. Meliodas destroyed it in the first episode of Signs of Holy War with Hellblaze. Certain things like Vivian's ring seem to be canon and we have not see the horn since that discussion with Ban so some think that it's really been destroyed in the manga.