Main Knowledge is divided into ten categories.

• Economic — this Knowledge improves the economic stats of your Town: building speed, resource production speed, capacity of resource buildings, capacity of convoys, and much more.

• Military — this Knowledge improves the combat stats of your troops and allows you to train more powerful warriors.

• Espionage — this Knowledge allows you to train scouts and improve their combat stats.

• Training — this Knowledge speeds up warrior training and reduces its cost, as well as improves your warriors' stats.

• Invaders — this Knowledge increases the battle performance of your Hero during fights with Invaders, Uber Invaders, and Monsters of Jotunheim.

• Hero — this Knowledge improves the stats of your troops led by the Hero, speeds up the crafting of the Hero's equipment, and increases the amount of experience the Hero gains.

• Tier I–V Troops — this Knowledge increases the offense, defense, and health of your tier I–V warriors.

• Tier VI Troops — this Knowledge increases the offense, defense, and health of your tier VI warriors, reduces their training cost, increases the number of warriors on a march, and affects enemy troop stats.

• Tier VII Troops — this Knowledge increases the offense, defense, and health of your tier VII warriors, reduces their training cost, increases the number of warriors on a march, and affects enemy troop stats.

• Shamans — this Knowledge increases the combat stats of your Shaman and troops led by the Shaman, speed up the rune fusing speed, improve the Shaman's stats during fights with Ghosts and Monsters of Jotunheim, and increases the amount of experience your Shaman gains.

You can see detailed information about any Knowledge by hitting its icon.