Refraction based on mesh shape

I’ve created a crystal staff mesh in Blender and used the transparency settings on materials to create refractions based on the shape of the mesh. I would like to reproduce this effect in UE. I’ve figured out how to add refraction but it’s not behaving like it should on a prism. From what I understand, I am supposed to input something into the normal on the material but I’m not sure what to use. How would I go about recreating this effect or producing something similar?

Also, How do I fix the issue of the missing face caused when I set part of the objects faces to be semitransparent?