Fey union is not going to be 480 potency. It is a fairy skill. 300 potency embrace scales to 200 potency real world potency. The new embrace will be 167 potency. Fey union will be 320 potency. Please look at Asts earthly star then come talk about potency. Plot twist. Asts earthly star would be 1080 potency if it went by fairy potency.