This has been a thing for months. Radiant skin adds 5% more damage resist than regular fireborn, not worth the trouble of switching every time, or might as well just run radiant skin in the first place.
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It might not seem much but on a 200 hp guardian it adds 44 hp which is almost a flame shield. With 50% you would have 400 hp and with 55% you would have 444 hp. It might make the difference in getting killed or not.