Edmontonia was an armored dinosaur that lived during the Late Cretaceous of western North America. Like other nodosaurid ankylosaurs, it lacked a bony tail club, but made up for it with large, forward-pointing shoulder spikes. If those were an insufficient deterrent, like other ankylosaurs it was covered in bony plates from head to the tip of its tail.
Like most other ankylosaurs, Edmontonia was incredibly wide, with a back that would have been surprisingly close to flat if you saw it in real life.