Executor's Remembrance quests in Elden Ring Nightreign provide more context about the game's mysterious characters and Limveld as a whole.
To start Executor's Remembrance quest, unlock the second chapter in Executor's journal by playing expeditions as Executor until it unlocks.
In Chapter 2 of the quest, you must pick flowers in Limveld by following specific in-game instructions and defeating the Stray Bloodhound Knight.
Completing the quest grants you Blessed Flowers as a relic, providing Executor a boost to dexterity and lifesteal when using the cursed sword with an active Character skill.