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. This reflected damage reduces in potency the weaker the enemy is though, so it is likely more convential ammunition will be required to finish them off. It is unknown if this ability can actually kill an enemy, or if it can only make them very weak like Acid.