I have a question to clarify.
All Sienna careers have talents for reduced block cost one way or another:
Battle Wizard: Burning Vigour
Reduces stamina cost of blocking attacks by 40.0% when Tranquility is active.
Pyromancer: Shield of Tarnus
Critical Mass also reduces the stamina cost of blocking attacks by 10% per 6 overcharge and stacks up to 5 times.
Block cost is reduced by 50% when Overcharged and blocking attacks vent Overcharge.
Am I thinking right and for Burning Vigour and Shield of Tarnus
resulting damage to stamina = damage * weapon BCR modifier * (100 - items BCR - talent BCR)/100
and for Dissipate
resulting damage to stamina = damage * weapon BCR modifier * (100 - items BCR)/100 * talent BCR
Or there is bug and Unchained Dissipate talent should give you 100% block cost reduction if you have enough BCR properties on items?