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Preservation of Knowledge — Abbasid Dynasty — AoE4 Analyzer

Abbasid Dynasty

Delhi Sultanate

Holy Roman Empire

House of Lancaster

Knights Templar

Macedonian Dynasty

Order of the Dragon

Tughlaq Dynasty

Zhu Xi's Legacy

Adjustable Crossbars

Civilization Guide

Abbasid DynastyTechnologies

Preservation of Knowledge

Preservation of Knowledge

Unique

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Research Technology

25

7530s

Reduce the cost of all technology and Age advancements by -20%.

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Researched at

House of Wisdom

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Military Wing

Angled Surfaces

Armored Caravans

Naval Arrowslits

Springald Crews

Cannon Emplacement

Springald Emplacement

Balanced Projectiles

Platecutter Point

Decarbonization

Medical Centers

Camel Rider Barding

Camel Rider Shields

Serpentine Powder

Silk Bowstrings

Court Architects

Lumber Preservation

Specialized Pick

Elite Army Tactics

Fertile Crescent

Improved Processing

Precision Cross-Breeding

Fitted Leatherwork

Fortify Outpost

Fresh Foodstuffs

Herbal Medicine

Incendiary Arrows

Lightweight Beams

Military Academy

Proselytization

Preservation of Knowledge

Professional Scouts

Survival Techniques

Public Libraries

Roller Shutter Triggers