Haran Tsukishiro Futsu is a 5 star Sword obtained from the Wish in Genshin Impact. It mostly appears along with Ayato’s banner .

Honed Flow

Obtain 12/15/18/21/24% All Elemental DMG Bonus. When other nearby party members’ Normal Attacks hit opponents, the character equipping this weapon will gain one stack of “Wavespike.” Max 5 stacks. This effect can be triggered once every 0.3s. When the character equipping this weapon uses an Elemental Skill, all stacks of Wavespike will be consumed to gain Ripping Upheaval. Each stack of Wavepike consumed will increase Normal Attack DMG by 8/10/12/14/16% for 8s.