Lumber Preservation

Lumber Preservation
Availability
Introduced in	Age of Empires IV
Civilization	All civilizations
Age	Castle Age
Research
Researched at	Lumber Camp Ger Steppe Redoubt Kura Storehouse
Prerequisite(s)	Double Broadax
Required for	Crosscut Saw
Food	100
Gold	250
Research time	60
Effect
Villager wood gather rate +15%

Lumber Preservation is a technology in Age of Empires IV that can be researched at the Lumber Camp, Ger, and various landmarks starting in the Castle Age. Once researched, it increases Villagers' gathering rate for Wood by 15%.

Civilization bonuses

• Abbasid Dynasty: Research speeds are +15%/+20% faster while Golden Age tiers 2/3 are active. If Preservation of Knowledge has been researched, this technology costs -20%.
• Ayyubids: Research speeds are 25% faster while Golden Age tier 2 is active
• Byzantines: Research speeds are 30% faster per water level at buildings within the influence of a Cistern with the Dialecticus ability active.
• Chinese and Zhu Xi's Legacy: The technology researches 150% faster when the Lumber Camp is supervised by an Imperial Official. For Zhu Xi's Legacy, this can be improved to 300% faster after researching Regional Inspection.
• Delhi Sultanate: The technology is free, but takes 5x as long to research (300 seconds instead of 60 seconds).
• French and Jeanne d'Arc: Economic technologies are 35% cheaper.
• Malians: Technologies take less time to research based on how much gold has been obtained through trade.
• Mongols: Can research Improved technology for another 350 stone - Villager wood gather rate +22.5%.

Changelog

• Originally, the Mongols' Improved Lumber Preservation provided an additional 5% gathering rate (for a total bonus of 20%). With Season Two Update 17718, it provides an additional 7.5% gathering rate (for a total bonus of 22.5%).
• Originally, Lumber Preservation cost 150 food, 350 gold and took 75 seconds to research. With update 24916, it costs 100 food, 250 gold and takes 60 seconds to research.
• With update 12.0.1974, the icon was changed to its current version. It previously used the same icon as Double Broadax.

Campaign version

Because the campaigns have not been rebalanced since the release of the game, Lumber Preservation has different stats there:

• It costs 400 gold and takes 75 seconds to research
• The Mongol improved version costs +400 stone and increases gather rate by an additional 5% only (for a total of +20%).