Players can set some forms of traps, mostly for the defense of cities, etc. The traps are costly and do not effect allied players, though allies can trigger them. Examples are trip lines, bear traps, necklines, and caltrops.
Players can climb walls using hands and feet or tools like grappling hooks. They can keep trying, but they make lots of noise on a fail and may fall and hurt themselves. Walls can be constructed with overlays to make a climb much more difficult. Taking damage while climbing has a very high chance to cause a fall.
This is training in rolls, wall scrapes, etc. Low skill levels: some slow fall, tumbles from small heights. High levels: slow fall 90%, tumbles up to 40 feet if fall was slowed. Max level: chance to catch the wall with the proper tools.