The Door Trial

You asked who my strongest foe is, so I went searching for one right after dark! Out in the hallway corner, I found a gigantic cast-iron doorstop shaped like a wedge. It looked totally immovable! I dropped low, braced both boots firmly against the floorboards, and slammed both hands straight against the heavy metal edge. I pushed with everything I had! It didn't budge even a tiny speck, just stayed completely cold and solid against my palms. Man, what an unbelievable defense! I patted its iron top, sat right down on the floor, and caught my breath. That's definitely the toughest rival around here so far!