After coming to [Leyndell, Royal Capital],depart from the Sites of Grace [West Capital Rampart],find [Corhyn] and talk.

Get the [Golden Order Principia] at the Sites of Grace [Erdtree Sanctuary]. 

Give the [Golden Order Principia] to [Corhyn].     Study incantations [Law of Regression].

Go out from the Sites of Grace [Erdtree Sanctuary],find a statue.

Using incantations [Law of Regression].     "Radagon is Marika".

Depart from the Sites of Grace [West Capital Rampart] to find [The Noble Goldmask].      Get the [Golden Order Totality].

Talk to [Corhyn].