The Construction Addition is a type of Gear usable by all Buildings . Construction Accessory typically enhance the wearer's train/research rate and cost but can also modify a myriad of other statistics.
Source [ ]
Found mostly from random drop chests .
List of Construction Accessories [ ]
Items available (in order of quality):
Image
Name
Level
Stats
Uncommon
Training Scroll of Amnisos
2
Train/Research Rate: +1.2%
Weathered Training Scroll
4
Train/Research Rate: +1.5%
Exceptional Wall Joints
6
Cost: -3.2%
Ordinary Training Scroll
14
Train/Research Rate: +2.8%
Superior Training Manual
24
Train/Research Rate: +4.1%
Artisan Training Manual
34
Train/Research Rate: +5.1%
Rare
Vanguard Training Scroll
5
Train/Research Rate: +2%
Lookout of the Four Winds
14 - 19
Line-of-sight: +20.7%%
Lookouts
20
Line-of-sight: +21.5%
Esteemed Training Manual
21
Train/Research Rate: +4.5%
Pharaoh's Training Manual
22
Train/Research Rate: +4.6%
Basic Training Methods
20 - 24
Train/Research Rate: +4.9%
Mycenaean Construction Blueprints
21 - 25
Build Time: -8%
Improved Wall Joints
19 - 25
Cost: -10.2%
Build Time: +24.2%
Spartan Training Manual
27
Train/Research Rate: +5.4%
Trained Lookouts
24 - 28
Line-of-sight: +27.3%
Knossos-Style Wall Joinings
24 - 28
Cost: -10.8%
Build Time: +26.1%
The Grand Architect's Blueprints
25 - 29
Build Time: -9%
Hunter's Lookouts
27 - 31
Line-of-sight: +29.6%
Iron Wall Joints
27 - 31
Cost: -11.8%
Djoser's Royal Construction Blueprints
35
Build Time: -10.5%
Thoth's Rules of Training
29 - 40
Train/Research Rate: +7.1%
Reinforced Wall Joints
30 - 40
Cost: -14.6%
Build Time: +34.7%
Legion Recruit's Lookouts
40
Line-of-sight: +35.8%
Council Acolyte's Blueprints
40
Build Time: -11.3%
Expert Lookouts
31 - 40
Line-of-sight: +36.2%
Epic
Contrebis' Master-Forging Design
37
Build Time: -13.4%
Eagle-Eyed Lookouts
37 - 40
Line-of-sight: +43.9%
Ares' Training Manual
37 - 40
Train/Research Rate: +8.8%
Adept Construction Blueprints
37 - 40
Build Time: -13.9%
Masterwork Wall Joints
37 - 40
Cost: -17.6%
Build Time: +42.0%
Legendary
Construction Blueprints of Khufu
40
Build Time: -14.8%
Delian Archon's Blueprints
40
Build Time: -8.3%
Health: +13.5%
Wall Joints of Kaveh
40
Cost: -18.4%
Build Time: +44.2%
Lookouts of Olympus
40
Line-of-sight: +45.7%