Increases ATK by 20%/25%/30%/35%/40% and grants the might of the Thunder Emblem. At stack levels 1/2/3, the Thunder Emblem increases Normal Attack DMG by 12/24/40%/15/30/50%/18/36/60%/21/42/70%/24/48/80%. The character will obtain 1 stack of Thunder Emblem in each of the following scenarios: Normal Attack deals DMG (stack lasts 5s), casting Elemental Skill (stack lasts 10s); Energy is less than 100% (stack disappears when Energy is full). Each stack's duration is calculated independently.