Sacrificing

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Sacrificing aura

Overview

Fuel can be sacrificed in Ancient Hearths to temporarily gain powerful positive effects. Sacrificing is extremely resource intensive and requires significant labor investment, or even restructuring of the whole settlement, should you wish you keep it up for an extended period.

Sacrificing mechanics

You can Sacrifice up to 3 stacks of Wood, Coal, Sea Marrow, or Oil. Each fuel's Sacrificing stacks are independent. To choose how many stacks you want to Sacrifice, use the green arrows next to the fuel type. Activating Sacrifice immediately consumes 1 unit of fuel, even if you are paused. If you only have 1 unit of this fuel to begin with, you will keep the effect for as long as you are paused. If you don't have any fuel of one type, its green arrow is going to appear grayed out. Do not forget to reset the stacks to 0 once the need for Sacrifice has passed - you will quickly run out of fuel otherwise. There's also a checkbox to Stop after storm.

There are 3 visual indicators of Sacrificing taking place:

• An orange aura around the Ancient Hearth.
• A Perk in a gray outline with the number of stacks in the Perk section on the bottom left of the screen.
• An exclamation mark in a yellow diamond next to the fuel Resource Category in the upper section of the UI. It says "You are sacrificing fuel in the Hearth." if you hover over it.

Sacrifice effects

Each fuel type grants different boons:

Sacrifice effects

Fuel	x1 Stack	x2 Stacks	x3 Stacks
Wood	-50 Hostility	-100 Hostility	-150 Hostility
Coal	-80 Hostility	-160 Hostility	-240 Hostility
Sea Marrow	+25% Glade Event working speed	+50% Glade Event working speed	+75% Glade Event working speed
Oil	+25% global production speed	+50% global production speed	+75% global production speed

Sacrificing efficiency

There are 2 modifiers that affect Sacrificing efficiency, outside of Cornerstones:

• Sacrificial Flame: resources sacrificed in the Ancient Hearth burn 10% longer. A Monastery of the Vigilant Flame level 7 upgrade.
• Prestige 18: the Ancient Hearth seems to have a defect. No matter how hard the firekeeper tries, sacrificed resources are burning 35% quicker.

The table below shows how much fuel you need to Sacrifice per stack to keep the effects, depending on your upgrades and Difficulty:

Sacrificing efficiency per stack per minute

Fuel	Base	With Sacrificial Flame	With Prestige 18	With Sacrificial Flame and Prestige 18
Wood	40	36	62	53
Coal	20	18	31	27
Sea Marrow	20	18	31	27
Oil	15	14	23	20

Forest Mysteries influencing Sacrificing

Mystery	Penalty	Activation
Faint Flame	Resources you Sacrifice in the Ancient Hearth burn 40% quicker.	Hostility 2
Unearthly Element	The maximum number of Sacrifice stacks in the Ancient Hearth is lowered by 1.	Hostility 1

Perks and Cornerstones influencing Sacrificing

1 Perks mentioning 'Baptism of Fire'.

Perk	Rarity	Description	Source(s)
Baptism of Fire	Legendary	"Every 3 burnt Blightrot Cysts lowers Hostility by 10. While the Hearth is corrupted, you’re unable to sacrifice resources."	as a Cornerstone

1 Perks mentioning 'Fiery Wrath'.

Perk	Rarity	Description	Source(s)
Fiery Wrath	Epic	Resources you sacrifice in the Ancient Hearth burn 5% longer for every Impatience Point you have.	as a Cornerstone

1 Perks mentioning 'Firekeeper Letters'.

Perk	Rarity	Description	Source(s)	Price
Firekeeper Letters	Epic	The exchange of knowledge between firekeepers can be very beneficial. The maximum number of sacrifice stacks in the Ancient Hearth is increased by +1 for every 2 ongoing trade routes.	purchased from a Trader	30

1 Perks mentioning 'Mark of the Sealed Ones'.

Perk	Rarity	Description	Source(s)
Mark of the Sealed Ones	Legendary	"A faint image of an underwater landscape shimmers inside the ancient jewel. While the Ancient Hearth is being corrupted, resources sacrificed within it burn 50% longer."	as a Cornerstone

See also

• Hearths
• Blightrot
• Forest Mysteries