Grave Key is a Key Item in Dark Souls 3.
- Opens a door in the sewer that leads to Velka the Goddess of Sin.
- From the Dilapidated Bridge bonfire in Undead Settlement, head across the bridge and into the sewer. On the lower level, you will find the door unlocked by this key.
- Sold by Shrine Handmaiden for 1500 souls (you need to give the Mortician's Ashes, located in the graveyard like area near the same bonfire where the giant shoots arrows at, to her to be able to purchase it)
- This key is not necessary to free Irina or access the statue of Velka. Using Spook or the Silvercat Ring allows one to survive the fall.