Ugh, since when? This makes no sense to me! First of all, why would an angelic relic have power over demons? Like the demonic motorcycles would the angelic energy have a negative effect on demons, not control them. It literally makes no sense to me, especially when this sort of contradicts biblical theology.
Or maybe, I’m thinking way too into it? Or maybe Cassandra Clare didn’t think at all to this. I just find this really all illogical and especially since Clare based her entire series on biblical theology.