Darkforce Manipulation: Darkstar had the ability to tap into and manipulate an intense-black form of extradimensional energy called the Darkforce. This energy, which appears to be related to the extradimensional black gas-like substance manipulated by Shroud and Cloak, possesses mass and form (whereas Cloak’s and Shroud’s does not).

It may be that it is the same substance and that Darkstar simply knows how to manipulate it to greater effect then the other two. Her power seems analogous to that of Blackout.