ArmorSet bonus
(1 item) Dealing direct damage grants you a stack of Hunter's Focus for 20 seconds, up to 10 stacks max. You can only gain 1 stack of Hunter's Focus per second. Each stack of Hunter's Focus increases your Critical Chance by 110 and your Critical Damage by 1%.
Taking direct damage removes 5 stacks of Hunter's Focus, up to once per second. Removing Harpooner's Wading Kilt removes all stacks of Hunter's Focus.