The Royal Capital changes for good when a late boss dies, and these go with it: the West Capital Rampart and Fortified Manor, First Floor graces, Valiant Gargoyle, Gargoyle's Halberd, Sanctified Whetblade, Hammer, By My Sword, Coded Sword, Seedbed Curse (manor library), Two Fingers' Prayerbook and with it Lord's Heal and Lord's Aid, Alberich's Set, the Flightless Bird Painting and with it Fire's Deadly Sin, Gravel Stone Seal, Stonesword Key (guardhouse), Ritual Shield Talisman, Duelist Set, Duelist Greataxe, Battle Hammer, Guardian Garb (Full Bloom), Barrier of Gold, Bolt of Gransax, Stonesword Key (gazebo by the spear), Black Knife Assassin and Blessing of the Erdtree. So do Nepheli's throne scene and the two stones it pays. Take each one now.