Umbral Ashes

Umbral Ashes can be given to the Shrine Handmaid in Firelink Shrine to expand her inventory of items.
Several NPC merchants will drop their respective ashes when killed, which will add the inventory of these NPCs to the Shrine Handmaid's inventory.

List of Umbral Ashes

Key Item	Usage	Acquisition
Captain's Ashes	Unlocks the Millwood Knight Set, Millwood Greatarrows and Refined Gems (3).	Found in the Painted World of Ariandel, at the top of a tower guarded by Millwood Knights.
Cornyx's Ashes	Extends the Shrine Handmaid's inventory to include Cornyx of the Great Swamp's	Dropped by Cornyx.
Dragon Chaser's Ashes	Unlocks unlimited Titanite Chunks, Twinkling Titanite, and Titanite Scales, as well as six Embers.	Found on Archdragon Peak, on the side of building near the Great Belfry bonfire (guarded by several Serpent-men and Large Serpent-men).
Dreamchaser's Ashes	Unlocks the Life Ring, the Leather Set, the Composite Bow, Feather Arrows, Titanite Shards, Green Blossoms, Black Bug Pellets, Rotten Pine Resins, as well as Gold Pine Resins (3), Gold Pine Bundles (6), Embers (3) and one Hidden Blessing.	Found in Farron Keep, behind an illusory wall near Old Wolf of Farron bonfire.
Easterner's Ashes	Unlocks Mossfruits, Large Titanite Shards, the Washing Pole, the Eastern Iron Shield, the Eastern Armor Set, Dark Arrows, Onislayer Greatarrows and the Wood Grain Ring	Found in Irithyll of the Boreal Valley, on a ledge below Anor Londo.
Excrement-covered Ashes	Unlocks Dung Pies, Stalk Dung Pies, Blue Bug Pellets and Blooming Purple Moss Clumps.	Found in the sewer entrance to Irithyll Dungeon.
Grave Warden's Ashes	Unlocks Embers (3), Yellow Bug Pellets, Kukris, Carthus Rouges and Titanite Shards.	Found in the Catacombs of Carthus, on a broken walkway near the Catacombs of Carthus bonfire.
Greirat's Ashes	Extends the Shrine Handmaid's inventory to include Greirat's. If these are found in Lothric Castle, they'll also extend the Shrine Handmaid's inventory to include six more Embers.	Dropped by Greirat. Found in Irithyll of the Boreal Valley in the sewer near the Distant Manor bonfire, if Greirat died on his second scavenging trip. Found on a roof outside the Grand Archives after Greirat departs for his third expedition.
Hollow's Ashes	Unlocks Purging Stones and Poison Throwing Knifes.	Found in the Untended Graves, at Yoel of Londor's spot in the dark Firelink Shrine, if Yoel died of "natural causes".
Irina's Ashes	Extends the Shrine Handmaid's inventory to include Irina of Carim's.	Dropped by Irina.
Karla's Ashes	Extends the Shrine Handmaid's inventory to include Karla's.	Dropped by Karla.
Mortician's Ashes	Unlocks Embers (3), Charcoal Pine Resins, Charcoal Pine Bundles, Human Pine Resins (3), Alluring Skulls (6), and the Grave Key.	Found in the Undead Settlement, in the graveyard near the white birch.
Old Woman's Ashes	Adds the Stone-humped Hag's inventory: Embers (5), Divine Blessing (1), Hidden Blessing (1), Rusted Coins, Rusted Gold Coins (3), Splitleaf Greatsword.	Dropped by the Stone-humped Hag.
Orbeck's Ashes	Extends the Shrine Handmaid's inventory to include Orbeck's.	Dropped by Orbeck.
Paladin's Ashes	Unlocks Blooming Purple Moss Clumps (4), Undead Hunter Charms, Duel Charms, the Morning Star, the Crescent Axe, the Canvas Talisman, and Lloyd's Shield Ring.	Found near the Cathedral of the Deep bonfire, guarded by the Unkindled Fallen Knight.
Patches' Ashes	Extends the Shrine Handmaid's inventory to include Unbreakable Patches'.	Dropped by Patches.
Prisoner Chief's Ashes	Unlocks Rime-blue Moss Clumps, Pale Pine Resins, and Karla's Set.	Found in the Irithyll Dungeon, in a cell unlocked by the Jailer's Key Ring on the upper level shortly after the Irithyll Dungeon bonfire.
Xanthous Ashes	Unlocks Gold Pine Resins, Gold Pine Bundles, Young White Branches, and the Xanthous Set (excluding the Xanthous Crown).	Found in the Irithyll Dungeon, in a cell on the lower levels where six Jailers are patrolling.
Yuria's Ashes	Extends the Shrine Handmaid's inventory to include Yuria of Londor's, as well as the Black Set.	Dropped by Yuria.