Briefly in her history, Polaris lost her magnetism power, but gained the ability to absorb negative emotions from the environment and use it as strength, endurance, invulnerability, and the ability to temporarily increase her height and mass [REF].
As the Horseman Pestilence, Lorna had shown the ability to ingest virulent diseases without harm, absorbing their traits, and according to Apocalypse is able to spread a "meta-plague" that will kill anyone who has not been inoculated with the virus' vaccine, the Blood of Apocalypse.