That, or she has her reasons for what she did. It could be that Terzo was always meant to be their "Jesus". His being decapitated is also not technically canon, it only appeared in an issue of Metal Hammer.

Terzo is also a good candidate for Copia's twin. They have similar behaviors on stage, and they both wear the same crest on their clothes. The song Prime Mover describes what can only be Sister Imperator and Nihil's child being the Antichrist, but Copia doesn't seem to be who it's referring to 🤔

I think that's a lamb (baby sheep), but it's still cute as heck.