Found at the beginning of the game in the Cemetery of Ash, on a corpse lying on the remains of the central fountain.
The total number of shared charges between the normal Estus Flask and Ashen Estus Flask can be increased by bringing Estus Shards to Blacksmith Andre, and the potency of each charge increased by burning an Undead Bone Shard at Firelink Shrine's bonfire. The number of total charges between the two flasks can reach a maximum of 15, while the potency of the flasks can reach a maximum of +10. The player can also talk to Blacksmith Andre to allot their Estus charges between the two flasks.
The potency of each charge of the Ashen Estus Flask can be increased by 20% by equipping the Ashen Estus Ring.
The amount of FP restored per use via upgrading with Undead Bone Shards is as follows:
|Bonfire level||Ashen Estus Flask level||FP restored||Difference from last level|
- The corpse from which the flask is obtained is clad in the Elite Knight Set, holds the Astora Straight Sword and Crest Shield, and lies before a shattered Lordvessel. This may be a reference to either Oscar of Astora, or the Chosen Undead.