Weapon and Valkyrie materials
Weapon upgrade materials by schedule
Use the rotating Material Event schedule to target the weapon material your chosen upgrade actually needs.
Supplies > Material Event; select the active stage listing the exact material shown in the weapon upgrade screen.
Repeat while the relevant stage is available and daily attempts remain. Availability follows the in-game schedule; it is not an unlimited, fixed daily farm.
Stop when you have enough of the named material for the next planned weapon upgrade, or switch to another activity if the current schedule does not list it.
Open a guide to find other locations and see what the item is used for.
Use the rotating Material Event schedule to target the weapon material your chosen upgrade actually needs.