Does anyone know a quick way to get the umbrite and the dust without having to do crafting?

Me being the person I am, ive been focusing on other things and havent done anything with any crafting. Im trying to get the Cronus Lux and am not having much luck with this step in the process.

Honestly im just trying to get it for the glamour (I know, a lot of work just for that, but still) so im not trying to upgrade it to the max or anything like that.