Cactus

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

Design
The looks identical to the Ribbon with the addition of a Hivemind-style dark ring around its body.

Technical
The has the unique ability to deal extra damage to anything that hits it, even when hit by a projectile. For example, if a Basic's bullet hits the, the Basic will receive a bit of damage as well, even if it is nowhere near the in question.