Horrifier

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

Design
The looks extremely simiar to the Mailman, but its it has a triangular decoration on top of it. It also seems to have an extremely subtle tapering base mounted behind the Mailman gun, which is only really visible if you upgrade to it from Mailman and look at the barrel's base as you upgrade.

Technical
As indicated by its decorative triangle, the is able to become invisible by staying still.

Gallery
(This image is actually missing the extremely subtle tapering base and needs replacement)