Hitting an enemy gives them 1-4 stacks of 2.5% Brittleness. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.
14-20% chance Elite and Special enemies Explode on kill.
24-36% Reload Speed if empty.
Based on milkandcookiesTW build. Its a solid build and since he didnt have a link, I thought I would share what i am using. Swapped to the Flame for easier stagger vs bosses in Damnation and endless hoard.
EDIT: tweaked the build a bit to what I am currently using on Damnation and this is so beast its crazy. Also swapped to Punishment from Retribution because I rarely go down in HP because mobs heads just pop almost instantly. Also, Interruptible for flamer helps a TON!