"Phoenix egg", recipe?

I got the phoenix egg and armor with phoenix egg in it's description. I found a skull pile in Ryker's rest cellar, it says "skull sentinel" it also has phoenix egg as it's description, it opens the crafting window. Is there a recipe to make the egg hatch or to enchant the armor? via /r/DivinityOriginalSin http://ift.tt/2C1ph4F