Cudgel

 is a Tier 5 Tank that upgrades from Shrapnel at level 60.

Design
The greatly resembles the Shrapnel but its firing barrel gains a slight taper. Rather than becoming wider, its base becomes thinner. The rest of its barrels remain the same.

Technical
As its design subtly indicates, the is essentially a Machine-Shrapnel. It fires slightly weaker nukes a lot less accurately, but at a considerably higher rate.

As the

 * The fires fast enough that you can always have an explosion ready. With high enough movement speed (or low enough bullet speed), you can keep yourself protected pretty much constantly.
 * While in your explosions, you can fire at enemies to slowly "move" your shield closer to them.