Estus Flask (Dark Souls)

Estus Flasks are healing items in Dark Souls.

Availability
An Estus flask is first granted to the player by Oscar before succumbing. Alternately, the player automatically receives the Estus Flask if they kill Oscar. Thereafter, players receive up to 5 estus charges by resting at an unkindled bonfire. A kindled bonfire yields 10 charges; further kindling bonfires through the Rite of Kindling rewards an additional 5 charges per kindle to up to 20 in total.

Effect
Estus Flasks are the basic healing items in Dark Souls. They are replenished via resting at bonfires. The amount they heal can be upgraded by offering Fire Keeper Souls to other Fire Keepers to up to +7. Alternatively, they can be consumed, fully healing the player and granting 5 liquid humanity.

Backstory
Estus are fondly treasured by the undead. Oscar names it "an undead favorite". On the other hand, the living are not cordial about estus. The undead hunter Lloyd created Lloyd's Talismans to aid in his extermination of the undead; Lloyd's Talismans block the healing ability of estus.