Target receives 1-4 Stack(s) of 10% Damage if already Staggered. Lasts 5s.
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.
30-42%Melee Strength for 3.5s on Hitting 3+ Enemies with a Ranged Attack.
10% Critical Chance for every 0.2-0.35 second while aiming. Stacks 10 times. Discharges all stacks upon firing.
Damage vs bosses? - check
Can deal with specialist? - Check
Can deal with elites? - Check
Can clear hordes? - Check
Also to add, you can easily solo monsters except for the DH, by just spamming Heavies, since that will regen your toughness just as quick as they can do damage.