Towers are a type of building in Artifact: The Dota Card Game. Towers are lane guardians, protecting each lane on the game board. There are a total of 3 towers, defending the three lanes. If there is no card adjacent to a unit and there is no pathing card directs the attack elsewhere, they will attack the Towers. Towers can be interacted with by nearly all types of cards.
Destroying two towers is one of the two victory conditions of Artifact - the other being destroying the enemy Ancient.