Mouun’s Moon is a 4 star Bow obtained from from the Wish in Genshin Impact.
Watatsumi Wavewalker
For every point of the entire party’s combined maximum Energy capacity, the Elemental Burst DMG of the character equipping this weapon is increased by 0.12%/0.15%/0.18%/0.21%/0.24%. A maximum of 40%/50%/60%/70%/80% increased Elemental Burst DMG can be achieved this way.