The following buildings and units become available in the Imperial Age. High Armory (Landmark) Castle Age Wandering City Siege Crew Refined Pistols Banded Arms Guard Castle Age Springald Location Boil Oil Imperial Age Cannon Location Monastery Castle Age Warrior Monk Herbal Medicine Blessing Duration Imperial Age Piety Tithe Barns Siege Workshop Units Castle Age Springald Mangonneau Counterweight Trebuchet Greased Axles Imperial Age Bomb Shutter Triggers Adjustable Cross Bars Siege Work Spasskaya Tower (Landmark) Castle Age Boil Oil Imperial age The following buildings and units become available during the Castle Age.
![age of empires 4 tech tree age of empires 4 tech tree](https://www.echo24.de/bilder/2019/11/19/13231898/795654193-age-empires-erscheint-koennen-sich-fans-definitive-edition-age-empires-zeit-vertreiben-1d8IuEaOQQef.jpg)
AGE OF EMPIRES 4 TECH TREE PROFESSIONAL
Trinity Abbey Castle Age Warrior Monk Improved Blessing Saint’s Scope Herbal Medicine Imperial Age Piety Tithe Barns Archery Feudal Age Archer Veteran Archer (Castle Age) Elite Archer (Imperial Age) Castle Age Crossbowman Crossbowman Elite (Imperial Age) Horse Archer Elite Horse Archer (Imperial Age) Imperial Age Streltsy Rise Accuracy Double Time Aries Blacksmith Feudal Age Flowering Decarbonization (Castle Age) Damascus Steel (Imperial Age) Steel Arrow Balanced Projectiles ( Castle Age) Cutter Point (Imperial Age) Tailored Leather Goods Isolated Helm (Castle Age) Mastered Blacksmiths (Imperial Age) Iron Mesh Compensated Rivets (Castle Age) Angular Surfaces (Imperial Age) Siege Engineering Castle Age Academy military High trading house Survival techniques Wheelbarrow Professional scouts Horticulture Fertilization (age of the castle) Precision crossing (imperial age) Market Feudal age Trader Tou siege Stable Feudal Age Scout Cavalier Veteran Cavalier (Castle Age) Elite Cavalier (Imperial Age) First Knight Knight (Castle Age) Elite Knight (Imperial Age) Castle Age Boyar’s Courage Imperial Age Sabers of knight Age of the castle The following buildings and units become available during the Feudal Age. Barracks Dark Era Spearman Hardened Spear Veteran Spearman (Castle Age) Elite Thrower (Imperial Age) Castle Age Elite Man-at-Arms (Imperial Age) Dock Dark Era Fishing Boat Lodya Transport Ship Lodya Feudal Age Trading Ship Lodya Attack Ship Lodya Extended Lines Driftnets (Castle Age) Additional Sails Castle Age Demolition Ship Loday Armored Hull Navigator’s Belvedere Clinker Construction Imperial Age Cedar Hulls Explosives Cultivate Fortified Palisade Gate Wall of Fortified Palisade Housing Hunting Cabin Dark Era Scout Survival Techniques Wheelbarrow Feudal Age Professional Scouts Horticulture Fertilization (Castle Age) Precision Crossing (Imperial Age) Kremlin (Landmark) Castle Age Springald Location Logging Camp Dark Era Forestry Age feudal Double wide axis Preservation of wood (age of the castle) Chop saw (imperial age) Mining camp Age Feudal Specialized Choice Acid Distillation (Castle Age) Cupellation (Imperial Age) The Golden Gate (Landmark) Town Center Dark Period Scout Villager Imperial Officer Feudal Age Textiles Wooden Fortress Dark Period Castle Turret Castle Watch Feudal Age Murderers Age of Castle Springald Location Related: All Rus Civilization Masteries in Age of Empires IV Feudal age
![age of empires 4 tech tree age of empires 4 tech tree](https://www.intoxianime.com/wp-content/uploads/2019/01/tech_tree.jpg)
The following buildings and units become available during the Dark Ages.
![age of empires 4 tech tree age of empires 4 tech tree](https://i0.wp.com/jadorendr.de/wp-content/uploads/2016/10/Tech-Tree.jpg)
AGE OF EMPIRES 4 TECH TREE UPGRADE
If a unit / upgrade is nested within another unit / upgrade, the parent list item is a prerequisite for the child list item.
![age of empires 4 tech tree age of empires 4 tech tree](https://cdn.ageofempires.com/aoe-forums/optimized/3X/9/8/98a9d8d9a3a61c792ee68c9ff6895fa0153e7e8b_2_690x388.jpeg)
The tech tree below is sorted in ascending order by civilization age, then alphabetically by building and by units / upgrades they provide at that age.