Immortals

 unit is special to the Achaemenid Persians. Unlocked by the Standing Army technology in the Classical Era.
 * Description
 * Both imperial guard and elite heavy infantry, the well-equipped immortals are the backbone of the Persian army.

Class and Specialty

 * Close-combat unit. Receives bonus combat strength when fighting mounted enemies.
 * Close-combat unit. Receives bonus combat strength when fighting mounted enemies.


 * Bastion
 * Stronger when fighting from high ground and fortified position.

Upgrades from
Upgrade cost and needs  access on empire.
 * Spearmen (generic)