This mob is a RNG that shows up in Al Zahbi during Besieged. It uses a standard ranged attack, using the weird cannon-thing it has strapped to it's back. It can also use some type of AoE shot, which will hit everyone within range.
I've never witnessed one of these two-hour during Besieged, like some of the other ones do. If it does, it should use Eagle Eye Shot, which would be scary coming from something so big. XD