Protip: try as hard as you can to capture and hold emerald castle. It gives you the emerald town material. If you withdraw it you can make standard emerald blocks with it that meet the requirements.
That's why lapis is more valuable, you need that too but this trick doesn't work on those because no castle produces them
That's why lapis is more valuable, you need that too but this trick doesn't work on those because no castle produces them