Bore (like Rend) is actually an anime-exclusive spell, having not been in the original manga version, in which Kofuku doesn't chant the spell.
This spell causes a vent to open, which will also cause a Phantom Storm, due to Kofuku's "bad luck". Phantom Storms are very dangerous, which is why Kofuku avoids using Kokki unless she considers the situation dire. Often, Daikoku shows resistance to being used for this spell.
O band of fiends treading upon sacred land! With the [Kokki], I pierce you! Bore!
(Most common translation.)
This casting sequence is very similar to Rend, which is used by Yato frequently in the series.
So far, only Kofuku has used the spell with her shinki, Daikoku. It is possible the spell can only be used by her, since it is a cause of bad luck, which is highly attributed to the god of poverty.