If someone could tell me the some easy fusions to get the four different elements, I'd really appreciate it.
For those that don't know, you can fuse an elemental with a demon to either rank up or rank down a demon. So for example, fusing an Aquas with an Angel will make an Archangel. Fusing an Aquas with an Archangel with make a Principality (I believe). But fusing an Archangel with an Erthys will make an Angel. For all demons, two of the elements will rank it up, and two will rank it down.
So far I only know that two Earth demons make an Erthys. (Hua Po + Kodama would be the easiest to make it)