In the late 1970s, Maximoff, now more powerful than ever and fueled by rage over Vision's death, was able to face Thanos directly in close range combat, managing to subdue and very nearly kill him, had it not been for his desperate air strike that knocked her back.
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Maximoff's reality warping abilities began initially on a small scale, however, as time progressed,as she gained her powers from it. Maximoff's powers are reliant on movement and focus, which means her enemies or opponents can stop her from using her powers by disrupting her concentration or restricting her movement.

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