The key to the mechanical towers is given to Illanchezhiyan by the queen. Tiberius, his dreams of a Greek empire in Tamil Nadu shattered and now surrounded by the enemy army, stabs her before Illanchezhiyan can run to her rescue.
The queen grants Illanchezhiyan access to the key to the mechanical towers, while Tiberius's ambitions for a Greek empire in Tamil Nadu are thwarted and he attacks the queen.