I Shall Be My Own Sword is a 5 star The Destruction Light Cones.

With This Evening Jade

Increases the wearer’s CRIT DMG by 20%/23%/26%/29%/32%. When ally gets attacked or loses HP, wearer gains 1 stack of Eclipse, up to a max of 3 stack(s).

Each stack of Eclipse will increase the DMG of the wearer’s next attack by 14%/16.5%/19%/21.5%/24%. When 3 stack(s) are maxed out, an additional attack will be delivered that ignores 12%/14%/16%/18%/20% of the enemy’s DEF.

This effect will be dispeled after the wearer delivers their attack.