Mordor Fortress Upgrades

imageDoom Pyres
Resource Cost: 500
Shortcut: D
Provides additional experience to nearby troops; Reduces hero cost by 10%; Reduces hero recruit time by 10%; Reduces the cost of builders by 20%.
imageLava Moat
Resource Cost: 1000
Shortcut: V
Decreases melee vulnerability of the fortress.
imageFlaming Munitions
Resource Cost: 1500
Shortcut: F
Equips barricades with fire arrows.
imageMagma Cauldrons
Resource Cost: 1500
Shortcut: M
Allows the fortress to pour burning lava on nearby enemy units.
imageMorgul Sorcery
Resource Cost: 1600
Shortcut: C
Increases fortress armor; Prerequisite to the Gorgoroth Spire.
imageGorgoroth Spire
Resource Cost: 2500
Shortcut: G
Requires the Morgul Sorcery upgrade; Allows the fortress to launch a giant fireball.