There is no such thing as a Permanent attack power. The best you can do is Continuous, which will maintain itself until you cease powering it or it is countered.
Page 70 - Core Book
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A Continuous Lasting power does not allow new saves against it at all; it lasts until the power’s effect is countered or reversed in some way, even if you switch to an Alternate Power (see page 108).
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While technically an optional supplement, Ultimate Power further suggests adding an "escape clause" to Transformations:
Page 92 - Ultimate Power
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Continuous transformations last until you choose to reverse them (or they are nullified). The GM can require that a Continuous Transform effect have some other reasonable way of undoing it, from a kiss from royalty to soaking in water, depending on the effect’s descriptors.
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