Polaris has a latent secondary mutation. Manifesting when her powers were stripped and taken by her half-sister Zaladane. This mutation was later deactivated by the Scarlet Witch's M-Day.
Negative Emotion Absorption: Polaris was able to absorb negative emotional energy to transform into a virtual powerhouse.
*Size Addition
*Superhuman Strength
*Superhuman Stamina
*Invulnerability.
*Negative Emotional Release: Her power also released the negativity back into her environment at an enhanced level, which caused others to act more violent, selfish, bloodthirsty, etc.
Meta-Plague Manipulation: As Pestilence, Lorna had the ability to ingest and synthesize new plagues without harm, controlling the virulence and particular genetic markers. She was then capable of then releasing this virus or plague as a combined mutated strain or as the various separate plagues they originally were.