The Guard Tower was a unit unlocked after researching the Engineering technology. It costed 20 stars to build, and although it was a building, it was in every other way considered a unit. The Guard Tower could only be built on empty field tiles. It was scrapped in the "Power" beta due to logistics issues.

Warrior, Rider, Archer, Swordsman, Catapult, Knight, Defender, Giant, Boat, Ship, Battleship, Mind Bender, Amphibian, Tridention, Crab, Nature Bunny, Scout (removed), Guard Tower (removed)