Crystal Solvent is a limited resource in Wuthering Waves, however there are some consistent ways of getting it.

How to use Echo Modifier in Wuwa Using the Echo Modifier in Wuthering Waves is quite easy. Keep in mind that only 5-star echoes that aren’t boosted can be modified.

How to Get the Echo Modifier in Wuthering Waves You’ll get the first batch of Echo Modifiers in your mailbox after you’ve logged in for the first time following the 2.3 update.