Defense Buildings are necessary to secure your own base. You can only upgrade them with gold. There are different kind of Defense building, some use magic others the power of your unit. Furthermore there are traps and mines you can use.


Ballista Watchtower City-Wall Divine-Hand
Ballista Watchtower City Wall Divine Hand
Anti-Arcane-Cannon Prophet-Tower Obscurity-Tower Ragnarok
Anti-Arcane Cannon Prophet Tower Obscurity Tower Ragnarok
Infernal Tower   


Gnomic-mine Spike-Trap Hades-Trap Darkfire-Mine
Gnomic Mine Spike Trap Hades Trap Darkfire Mine
Psychosis-Trap Deathbringer
Psychosis Trap Deathbringer