The level of your construction research determines which magic items you are allowed to craft. Some construction spells also allow you to make magic units. – Illwinter.
Construction mostly allows you to forge items; every even-numbered level in Construction opens up a new tier of items for you to forge. Links to lists of these items can be found at the bottom of the page.
Odd numbered levels in Construction offer a few new spells. The most significant of them are Legions of Steel (enhancing troops' armor), Weapons of Sharpness (allowing your troops to cut through armor), and Golem Construction.
|Concepts||Blood Hunting • Communions • Empowerment • Gems • Items • Magic Sites • Research|
|Categories||Combat Magic • Ritual Magic • Notable Spells|
|Paths||Fire • Air • Water • Earth • Astral • Death • Nature • Blood • Holy|
|Schools||Conjuration • Alteration • Evocation • Construction • Enchantment • Thaumaturgy • Blood • Divine|