ATK is increased by 12%/15%/18%/21%/24%. Casting Echo Skill grants 1 stack of Bamboo Cleaver, which grants 30%/37.5%/45%/52.5%/60% Heavy Attack DMG Bonus to the wielder. This effect can be triggered by Echoes of the same name once only, stacking up to 2 times, lasting for 30s. When Bamboo Cleaver reaches max stacks, casting Echo Skill resets its duration. Casting Intro Skill grants 20%/25%/30%/35%/40% Echo Skill DMG Bonus to all Resonators in the team for 30s. Effects of the same name cannot be stacked.