Heya, i've been playing Engineer for almost 3 years and recently switched to Vindicator for a break. I got to say, i love the class design so far. One thing that came across as a glaring issue to me though was the existence of "Energy Meld" and my question is: What is it even for ? We trade 10 Energy for 25 Endurance on a 20 second cooldown and it even has a cast time which interrupts the combat flow and can be interrupted. I am pretty sure i am not the only one NEVER using it because it is just too weak.
My suggestion would be to have Energy Meld have an effect based on which two stances you are combining (for example: using Assassin and Dwarf stance together should produce a skill which reflects the strengths of the two, so either some a mix of Quickness/Fury and Stability/Protection boons or a unique buff).
All in all, that would amount to 10 different combinations of stances which shouldn't be too much.