Roentgenium

 is a Tier 5 Tank that upgrades from Iron and Auto-Smasher at level 60.

Design
The is simply a combination of Iron and Auto-Smasher. It looks very similar to Auto-Smasher, retaining its signature Twin turret, but its plain Smasher shell is changed to match the color of Iron's unique shell.

Trivia

 * This tank was an idea by Earth-Kun from the discord.