Every class got a class specific cooldown helm this patch. Sentinels is very underpowered compared to the other classes. 5 - 10% cooldown recovery is the lowest of all classes and 10 - 25% void resistance is very bad because we have 10 ways to get free void resistance and we never build void resist on gear like never ever. Also you lowered the armor value from the previous base dawn helm to 225.
Also if u are balancing sentinel things based around volatile reversal being in the game could you please just remove the skill. thanks 