One Handed sword onlyEffect: Accumulated HP depends on how many damage you received. More effect when you have a target's aggro(Shield Only). Using Knight’s Stance will recover HP the same amount as how many Accumulated HP you have. You can accumulate HP multiple times until 100% -- Normal effect Gain Accumulated HP = (Skill Level)% of damage received [Min Value is 1] -- If you have target’s aggro and equipped with shield, then Gain Accumulated HP = (3 * Skill Level)% of damage received [Min Value is 1]
Damage received after P.Defense and Before barrier from equipment. - There is an indicator % on below Knight’s Stance buff timer. That indicator can let you know how many HP you accumulated. Numbers is based on your MaxHP(meaning, if it is 4% then can be healed up to 4% of MaxHP)