After killing it and you trap it's soul go to the Vivec guild of mages and go talk to Janand Maulinie and select the opption of enchanting, before you do this make sure you have some pretty soul gems with soul in them. The golden saint may cast a dispel spell on it's self, in this cast it might be best to have a weapon with soul trao before you fight it. Making contant effect items without using a grand soul gem with a golden saint, first go get a grand soul gem without a soul then go to the Caldera guild of mages, then go talk to Folms Mirel and buy a srcoll of summon golden saint, then go some where without peolpe and summon it, then cast a soul trap spell on it and kill it.