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.

• Fire
• Air
• Water
• Earth Create mechanical warriors. also Great for buffing troops with Leigons of Steel, and Weapons of Sharpness.
• Astral Makes Juggernaut.
• Death
• Nature Create Lumber Construct

• Fire & Earth super Late game create Iron Dragon for fun.
• Death & Air can make Corpse Man Constrution which are great in terms of gems to chaff numbers if you have the associated gear.
• Death & earth super Late game create Poison Golem for fun.
• earth & astral make the great Super comabten chassi with Golem Construction.
• nature & death Create Undead plants with high fatigue vine attacks.

• List of Trinkets (Construction 0)
• List of Lesser Magic Items (Construction 2)
• List of Greater Magic items (Construction 4)
• List of Powerful Magic Items (Construction 6)
• List of Artifacts (Construction 8)

Magic
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