A good page to test end-game Essence gear on.
When I use it I remove all the gear that has Essence slots but keep LI's and gear without slots.
I remove virtues and pick the trait line I normally use in instances.
I also think about what mitigation scrolls add and if I have any skill that increase things, for example Guards ward add tactical mitigation. Since I always have that going I add that number to mitigation number.
Pick your class
Type in stats on the right side.
Pick your virtues bottom left.
Start playing with essence gear and Essences. If you hover over the gear you see what bonuses each provide.
To get T2 numbers press the X2 button, second from the right side at top.