I need mythril to make the divine symbol. The dungeons that have mythril seem to be inaccessible while the magic dome is active. What mythril I had already gotten went into new tools.

Is there a way to get mythril? I have some mythril tools and weapons but I'm not aware of a way to disassemble them.

Or do I need to load an older save?

Thanks!

Other way is accepting the reward from the miners when you defeat the female demon for the first time... they will give you mythril  and other materials.

Should be fixed in latest version