It’s one of the self destruct units but when it activates, as well as doing area effect damage it creates a hole in the map (assuming it’s on a plain tile). Combined with push pull type phobies it could be really deadly.
I’d expect it to cost 4 or 5 credits and have stronger than average defence for this type of unit but lower attack.
Could look like a spider drone with a drill on its head. When it attacks, the explosion throws it up, then it comes down head first, making the hole.
