In Wuthering Waves, Lustrous and Radiant Tides are essential to Convene. Essentially, you need these Tides to draw Resonators and weapons from the standard and special banners. What that means is that the more Tides you have, the more often you can draw and (hopefully) get the Resonator and weapon draws you want.

This is a crucial resource, meaning there are quite a few different ways to get both Lustrous and Radiant Tides in Wuthering Waves.

There are nine ways to obtain Lustrous and Radiant Tides in Wuthering Waves: Codes, Afterflow Coral Exchange, Oscillated Coral Exchange, Tidal Exchange, Simulation Training Store Exchange, Union Level Rewards, the Daily Check-In, the Battle Pass, and the Souvenir Store.

Lustrous Tides (Blue) are used to draw at standard character and weapon banners. Radiant Tides (Gold) are used to draw at special character events or weapon banners.