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.
My thoughts and reviews
Lady Jinte wrote:
Vlorsutes' Negotiation Skill rises 0.2 points
Vlorsutes' Observant Parent Skill rises 0.3 points
Vlorsutes' Argument Diffusing Skill rises 0.1 points
on all sorts of sci-fi stuff...and things.