Flattener

 is a Tier 5 Tank that upgrades from Annihilator and Steamroller at level 60.

Design
The is essentially a scaled-up version of Steamroller. Its tip barrel is thickened and widened to the width of Annihilator's barrel, that is to say the same width as the entire tank. The supporting barrel is also widened, looking to be about the width of a Pounder barrel.