The Matterstorm creates a storm of Dark Matter over a large area. Enemy units caught it it are immobilized and they take damage. Friendly Masari units in Dark mode will have their Dark Matter armor regenerated while they are in the Matterstorm.
Dark Embrace - The increased efficiency in handling Dark Matter increases the duration of the matter storm superweapon by 100%, and also heals Masari units. Available from Dark Tech Tree Suite 4