Shuriken

 is a Tier 4 Tank that upgrades from Auto-3 and Tri-Trapper at level 45.

Design
The is an Auto-3 but with Trappers in the empty spaces.

Trivia

 * According to the changelogs, Shuriken was meant to be an Auto-Turret counterpart of Fortress.
 * Shuriken is somewhat similar in appearance to Hexidecimator.