Engineering was the Tier Three technology after Shields. It unlocked the Destroy ability, allowing buildings to be destroyed, and the Guard Tower unit. However, Engineering was removed in the "Power" beta, with the Destroy ability moved to the Construction technology and the Guard Tower being scrapped.
Midjiwan has stated that defensive structures like the Guard Tower will not be re-added to the game because they slow down the game too much.
The Guard Tower, a “unit” formerly unlocked with Engineering
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