Ronnie creates a storm:
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Utilizes a type of x-ray vision to see inside Brimstone's body:
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Reconfigures all the available light in an area, into a single laser beam:
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Utilizing intangibility, Firestorm plunges into Brimstone's body in order to remove the device which powers him. After ripping said device from Brimstone, Ronnie transmutes the remainder of his vessel into water:
Though I don't think Firestorm's ability to survive high temperatures has ever been in question - It should also be noted that despite the core temperature of Brimstone being greater then that of the sun, Ronnie easily endured it, with no ill-effect.