Cobalt

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

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

Technical
The retains Bonker's enhanced stats and small size with the added perk of debuff immunity.