The robe gives temporary boost in magical power at the expense of one's health. Despite having a very powerful Fortify Magicka enchantment, it drains health on self for six-hundred points when cast, and both effects last for only one second, effectively killing the wearer that has less than a total of six-hundred points of health.
Because of its enchantment, it is not advised to cast the spell of this robe, it may be of more use, if it is donated to the Museum of Artifacts as one of two required artifacts to receive the Dwemer Battle Shield from Torasa Aram as part of the main questline.
The Nerevarine must help Nerile Andaren cure citizens of Mournhold from a plague. Which will lead them to be confronted to Gedna Relvel.