During Painted Dome, after Kaveh’s Normal, Charged, or Plunging Attacks hit opponents, his Elemental Mastery will increase by 25. This effect can be triggered once every 0.1s. Max 4 stacks. This effect will be canceled when Painted Dome’s effects end.
aka I'm too smart and cool to check it myself on the net, or use a calculator like genshin aspirine...