Proctiv's breach crystal sphere

Proctiv's Seal Crystal Sphere was a powerful arcanist spell that permanently shut off a whole crystal sphere against access by spelljamming ships. It was actually the reverse version of the name-giving spell Proctiv's Breach Crystal Sphere, which removed a Seal Crystal Sphere cast earlier, thus opening up portals through that crystal sphere again.

The material component for this spell was a spelljammer of 100 tons, including a major helm.