Ansbach will relate the information to you from the scroll. Essentially, Miquella plans to use Mohg's corpse to resurrect Radahn and make him his king consort and in doing so, abandon Mohg's soul. Understandably, Ansbach is upset by this.
Rest at a Site Of Grace and return to Ansbach, he will give you a letter to pass onto Freyja (if you have also spoken to Elden Ring Items Freyja in the Specimen Storehouse).
Choose whether you wish to give the letter to Freyja. She is located at the Storehouse, Seventh Floor Site Of Grace. If you give it to her, she will fight against you in a future fight, meaning you will receive her armor and Greatsword. If you withhold the letter she will not fight you but will disappear from the Shadow Keep once you discover Enir-Ilim. See our Freyja questline walkthrough for more information.
Rest again and speak with Leda at the Highroad Cross where she will confirm that Ansbach is her next target.
Note: Make sure you speak to Freyja on the 7th floor before giving the Secret Rite scroll to Ansbach. Otherwise, the only way to obtain the 'Letter to Freyja' quest item is by siding with Leda against Ansbach and killing him. More on this below.Assist Ansbach or Leda?
After completing these steps and resting at a Site Of Grace, Ansbach will no longer be in his usual room. Instead, there will be two summon signs to choose from - either to help Leda or Ansbach. These are the following outcomes depending on what you choose:
Assist Leda: Ansbach dies, you'll get Ansbach's Longbow, Wise Man's Mask, Ansbach's Attire, Ansbach's Manchettes and Ansbach's Boots. Leda will disappear from the map for now. You'll receive the Noble Sanguine Nataan as an optional summon in an upcoming fight and the Retaliatory Crossed-Tree Talisman which enhances attacks executed after rolling or backstepping.
Assist Ansbach: Leda dies temporarily and you'll receive Leda's Rune (worth 40,000 Runes) and Ansbach's Longbow. Ansbach will be a summonable aid in two upcoming fights (one of these is the final boss of the DLC). After the last boss, if you summoned Ansbach, you'll get the gear mentioned above as well as the Obsidian Lamina and Furious Blade of Ansbach.
Skip the fight: If you choose to ignore the fight altogether, Ansbach will survive and he will be available as a summon for the Enir-Ilim fight.
Whichever option you choose will ultimately affect your next encounter with these NPCs. To get to this point, you need to Elden Ring Items for sale advance to Enir-Ilim. This will take a fair bit of progression as this is ultimately where Miquella is located.
The Wall