Goblin Fortress Upgrades

imageBat Cloud
Resource Cost: 500
Shortcut: C
The fortress gains a vision bonus and can detect stealthed units.
imageRazor Spines
Resource Cost: 1000
Shortcut: R
Damages enemy units adjacent to the fortress.
imageFire Arrows
Resource Cost: 1500
Shortcut: F
Equips your arrow dens with fire arrows.
imageWeb Cocoon
Resource Cost: 1600
Shortcut: W
This upgrade strengthens the walls of the fortress so it can withstand a siege longer.
imageDragon’s Nest
Resource Cost: 1000
Shortcut: D
Requires the Web Cocoon upgrade; Allows summoning of the Fire Drake.