Statting magic device

I want to stat dark element to Lil Empress or other clean magic device having high pot. Which recipe is the best?
And i have heard that fire element is easy and adavantageous especially to lil empress magic device. What does that mean?
Plus do you know any magic device that is advantegeous to statting dark element?
Ty for reading

 

There's statting guides in Game Guide section that has information about adding elements to any weapon including Magic Device. Fire element is advantageous when being added to Lil Empress Magic Device because the Original element is Fire so it costs 10 pot instead of 100 pot to add the element. There are no Magic Device that are player craftable besides Irogeon that has Dark element as Original element at this time which Irogeon is a greatly outdated Magic Device so there is nothing advantageous about it.

 

Thank you for nice explanation!! i appreciate your help