AOE IV / Technologies
Preservation of Knowledge
Reduce the cost of all technology and Age advancements by -20%.
TechnologiesAge of Empires IV: Anniversary EditionUnique to select civilizations
What it does
Reduce the cost of all technology and Age advancements by -20%.
How it fits into a match
Research at <a href="../buildings/house-of-wisdom.html">House of Wisdom</a> once its age and civilization conditions are met. The effect list shows exactly what changes; prioritize it when the units or buildings affected are part of your current plan.
- Role
- Research Technology
- Earliest age
- Feudal Age
- Available to
- Abbasid Dynasty
- Produced or researched at
- House of Wisdom
Research conditions
Earliest listed form for each civilization in this game-data snapshot. Unit and building statistics are shown for that form; later-age upgrades and civilization bonuses can change values.
| Civilization | Age | Cost | Time |
|---|---|---|---|
| Abbasid Dynasty | Feudal Age | 25 wood, 75 gold | 30 s |
