Quadratic

 is a Tier 5 Tank that upgrades from Catapult and Rocketeer at level 60.

Design
The has a wide, tapering barrel at its base and a smaller tapering one attached to its end. It overall resembles the Catapult with a wider, reverse-tapering barrel.

Technical
Like the Catapult, the Quadratic fires missiles that shoot their own missiles. What sets it apart however, is the fact that its sub-missiles are Rocketeer missiles instead, rather than just Launcher ones.