Some questions:
Can a build like this defeat mad queen and tougher bosses easily?
Is it still necessary to invest a lot of devotion points into defensive bonus?
Whirlpool - Is it worth to use now?
Blizzard/Elemental storm - which one is better for this build?
…as for this the latest Misadventure should tip you off on the future of defensive options (while simultaneously clueing you in on the current state by proxy). http://www.grimdawn.com/forums/showthread.php?t=46250
Why do you have points in PB and Trozan’s? That being side, even after all the buffs ABB is still weak compared to other skills that a Spellbreaker has access to.
You should try a PB spellbreaker with Warpfire. It’s really strong.