Caesium

 is a Tier 5 Tank that upgrades from Iron and Kamikaze at level 60.

Design
The is simply a combination of Iron and Kamikaze. It looks very similar to Kamikaze, retaining its signature five-sided shell, but the color of its shell is changed to match the color of Iron's unique shell.

Technical
The retains Kamikaze's ability to self-detonate, with the added perk of debuff immunity.

Trivia

 * Caesium is a name of an element in the periodic table that is mostly found in pendulum clocks. It melts at room temperature, That's how the Caesium tank got its name.