For Defiance, if it was +25% HP and +25% healing received, that would be a huge buff to the healers as well, making the HP scale easier. Given that there would be a buff to healing, already, I would like to see the stacks of Wrath give %parry instead of healing received.

Also, a significant change that would make one ability that, while cool in concept, isn't effective at all in pvp, is Holmgang. If you removed the self-root and instead put a buff of +40% parry on it, making it a 6s root on target and a 40% parry buff for at least 12 seconds, that would put it very close in line with Bulwark that the paladins have.

And speaking of Paladins, a very beneficial change with that would to be to change the cross-class ability from Convalescence to Rampart, this would give us a more beneficial cooldown ability to use, while doing nothing as far as creating a new ability. Paladin gets our -20% damage taken effect, adding to their repertoire of useful abilities.