I miss that lumbering Reaver from SC1. I liked it's design of a robotic caterpillar, so I took that idea and changed it up a bit. Keep in mind these unit concepts are more for my portfolio, so don't take them too seriously. As far as its ability, a Robotics Facility and Stargate can be rallied to this unit, this will cause units from those buildings to appear on the field at the Warp Reavers location if it's warp gate is activated (while activated it can not move). The biggest problem I thought of with this unit idea was trying to justify why a player should be making more than just a couple per game. I thought of the idea of limiting one building being rallied to a Warp Reaver at a time, but that's a poor excuse to give players motive to build them. So I thought of a second ability that it could do. Perhaps it could use an energy based ability that sucked in missile attacks, similar to an ability the Mothership had pre WoL beta. It would suck in missile fire in a short cone radius, but this would have to be used wisely, since the Warp Reaver is very slow at pivoting.