Imaginário Inimaginável

You could try to achieve this by borrowing a friend's Welt. Go into a Calyx with imaginary weakness, and bring a Welt friend. Then run 6 battles at once (this is considered a single battle).

In the Chinese version ( 虚数不能解释一切; lit. Imaginary cannot explain everything), it is a HI3 meme, originated from the dialogue of Rozaliya Olenyeva: "Can Honkai explain everything?" (Honkai is said to be a natural selection system of the Imaginary Tree). It's used to make fun of incomprehensible and illogical plot points. - Credit: Necrosyrtes