Domino is a mutant with the ability to subconsciously and psionically initiate random telekinetic acts that affect probability in her favor by making improbable (but not impossible) things to occur within her line of sight, thus causing her to have "good luck" and her opponents to have "bad luck." This "probability field" phenomenon can be anything from an enemy's equipment failure to hitting just the right switch with a stray shot to shut down an overloading nuclear reactor. The full extent of her powers is still unknown.
This subconsciously controlled talent is triggered when she is in a stressful situation (such as fighting or escaping). This effect constantly emanates from her body at all times and is completely subconscious. However, it is also largely participatory - in order for the luck to take effect, Domino herself must engage in an action whose chance she can affect.
For example, if debris falling from the sky was about to hit her in the head, she would still be hurt if she stood still. However, if she tried to avoid it, she would move perfectly to avoid each and every piece about to hit her. In addition, if Domino were to stand before a hail of bullets she would be a bullet-ridden corpse. Instead, she must take action, attempting to avoid the gunfire, and would miraculously bob-and-weave just perfectly to avoid every single shot.
Selene is a "psychic vampire" with the ability to sustain herself by psionically draining the life force of other human beings into herself. If she drains a person's entire life force, the victim dies and crumbles to dust in seconds. If Selene only drains the victim's life force partially, she achieves a measure of psychic control over her victim's mind, thereby subverting them to her will. Through unknown means Selene can also cause a human being to become a psychic vampire like herself, but be subordinate to Selene's own will. Selene's youthful appearance and vitality depends upon her absorbing the life forces of one or more people on a regular basis. This restores Selene to a youthful and healthy appearance when she has been injured, or when she over-exerts her other powers, and sustain her centuries-long life. A side-effect of this process is that Selene remembers the life of anyone she absorbs.