It's dependent on how many pieces of the set you're wearing. If I recall, it's about 2% for two pieces, 4% for 3, 6% for 4, and 10% for all five pieces. That being said, despite what you might see a lot of people using, using full Empyrean is not the way you want to go. Optimal TP setups nowaday only use the Empyrean head and feet +2'd, and even easier to gear sets still only use about two pieces at most.
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