Boa burbulla
Boa burbulla is a fourth level abjuration spell that is cast upon the self and lasts for up to ten minutes and requires concentration to maintain.
The discovery of boa burbulla gave a solid defense against the radiation of dark energy as it produces a nullifying effect at a radius of thirty feet from the castor. The energy field moves with you and is centered around the wand. It causes no other effect than to protect against possible necrotic damage.
As with most spells concerned with dark energy, this one has little use outside of a battlefield. Today it is strictly used as a protection for researchers studying the mysterious radiation.