So I was killing Arhats in the spirit realm and I right clicked on one and under it it said examine Tarddiad swamp light. So it is possible there is a connection between the realm of Tarddiad and Aminishi.
Yeah their connection is reused graphics. The same thing happened when Order of Ascension came out. You could search one of the dead bodies for a colour wheel and the examin text implied it was killed by a Dark Beast.