Forum:Where do I get the materials to evolve 4*'s to 5*'s? Horsemen Sordis specifically? And why won't it show me at least what materials are needed rather than just question marks?

Where do I get the materials to evolve 4*'s to 5*'s? Horsemen Sordis specifically? And why won't it show me at least what materials are needed rather than just question marks?