Reciprocator

 is a Tier 5 Tank that upgrades from Boomer and Nightworker at level 60.

Design
The looks very similar to Boomer but its tapering base is much longer. This leaves only a sliver of the non-tapering barrel visible between the base and the tip. Overall it somewhat resembles the but with the proportions of Boomer.

Technical
As indicated by its branches, the is simply a Boomer that can become invisible by staying still.