About Auras

Got a question about auras. I found that you can edit an exsiting aura by just changing the buff art thingy. But can you create new ones?
Like lets say you got your new spell (it's an aura) and the base is the Unholy Aura spell. So it would use that spells buff art and you can change it but you would be changing the Unholy Aura art as well as your new one. How would you use that base spell but connect a new aura to it so you could still keep the old one?
I know how to set up the aura in the txt but how do you connect it to the spell? Lets say your code is A000, you could make your buff AB00 and just add in the nessary art stuff, buff tip ect. But I don't know how to connect the damn thing. Any help would be appereated.

Unfortunately this is not possible. There is no way to create new buff arts.