Sir Gideon Ofnir’s spell rotation changes if you have defeated any or all of the following bosses: Mohg, Lord of Blood; Rykard, Lord of Blasphemy; and Malenia, Blade of Miquella.

Talk to Sir Gideon Ofnir to get the Lord’s Divine Fortification as a reward. If Gideon doesn’t give you this spell, progress through the story and burn the Erdtree.

You’ll spot an figure standing at the end who will be Sir Gideon Ofnir, the All-Knowing. He carries the Scepter of All-Knowing and you need to defeat him to get in Elden Ring.