Grey Mourner

The Grey Mourner is found in the east area of the Resting Grounds, behind breakable walls. Requires Desolate Dive or Descending Dark to reach.

When spoken to, the Grey Mourner will talk about her dead lover, the daughter of the Traitor Lord, and requests the player to take a Delicate Flower to her grave, located in the Queen's Gardens This flower will break if the player rides a Stag Station or takes damage.

Successfully completing this quest yields a Mask Shard, making her quest required for 100% completion.

Delicate Flower tactics
Isma's Tear is needed to access the Queen's Gardens. Before accepting the flower, it is recommended to go to the Queen's Gardens and unlock the shortcut to the local Stag Station. This is because the path to the grave of the Traitor's Child is located in the same room as the entrance of said station. If the shortcut is unlocked, the player will have to face only one Mantis Petra in the Gardens on the way to the grave. If not, it's a very long way fraught with difficult platforming and powerful enemies, which are almost guaranteed to destroy the flower.

It is a good idea to do this quest before the Forgotten Crossroads becomes Infected, as the Furious Vengeflies are extremely fast and aggressive. This will limit the offensive options, since it is not possible to get the Monarch Wings without killing the Broken Vessel and thus triggering the infection. However, on the optimal route, the only threatening enemies faced will be one single Mantis Petra and a few Spiny Husks. It is recommended to have at least the Great Slash, a Coiled Nail and Fragile Strength for dealing with those.

If the Crossroads are already infected, it is recommended then to wait to have a Pure Nail and use the Grubberfly's Elegy in combination with Quick Slash and Fragile Strength.

One good route is to leave the Resting Grounds through the Blue Lake and into the Forgotten Crossroads. Once there, head towards the room to the bottom left of the map, the one with the acid pool. Dive into the acid and take the shortcut to Fog Canyon, then head into the Queen's Gardens. Oomas and Uomas are very passive, making the trek fairly easy to do without being damaged as long as there is no collision with anything on the way down through the vertical shaft. In the Queen's Gardens, take the shortcut towards the Stag Station. There are three spiky sections in the corridor that leads to the grave.

The grave can also be approached from Fog Canyon through the Fungal Wastes, as showcased here.



Trivia

 * The Grey Mourner is heavily implied to be Ze'mer, one of the five Great Knights, due to the large nail in her home, and comments about serving under the Pale King when shown the King's Brand.
 * On top of that, her speech pattern uses the word "Le'mer," which is very similar to "Ze'mer"
 * Her physical figure also fits the Dung Defender's statues of the other Knights
 * What's interesting about this theory is that other characters encountered who have known the Dung Defender all comment on the player wearing the Defender's Crest, but not the Grey Mourner.