A hypergridintrusion (or gridfire) is the channelling of the energy grid into real space. It has a blindingly white appearance.
By the Idiran-Culture War, both the Culture and the Idiran Empire had sufficient expertise with the grid to form gridfire.
Novalevel gridfire was used by the GSV Eschatologist to destroy Vavatch Orbital during the Idiran-Culture War.
The Dra'Azon used a weapon resembling gridfire to enforce the Quiet Barrier around a Planet of the Dead.