Void catoblepas drop rewards problem

I tried farming for the rare void materials so that I can unbind the weapons. I got extremely frustrated that drop rewards from catoblepas is very low. Please explain why?

It tends to be better to wait for double drops on Void Battles for that reason. That way in the case that you finally get it to drop you get two of them.

Keep in mind for some drops you can trade up or down a rarity as needed. Best to avoid it as it’s a net loss to do so but it comes handy if you need to do so. I believe the only exception are Chimera Horns but that’s it.