Just like the name implies, the Ponderous Crampons fit over boots and secure a climber to a surface. The Ponderous Crampons allow someone to walk on not only ice, but also on walls and ceilings. Movement is limited to a prosperous walk. This device causes each footstep to resound like a giant metal shod foot. The user will behave as if gravity is pointing at their feet, but any item released will fall in the correct direction for normal gravity.
The user is slowed incredibly and cannot sneak up on anyone. However, if they are motionless and on a wall or ceiling, they will receive a +1 to surprise. In combat, the wearer loses their Dex adjustment if standing on the ground. However, the bonus returns if they are standing on walls or ceilings. This is due to the novelty of the situation, not a return of speed. Likewise, thieves attempting to hide in shadows receive a +10% bonus if they abandon the floor for another unusual surface.
The Ponderous Crampons lock firmly on the feet with a sort of crank like contraption. It takes two rounds to don them, but only 6 seconds (a segment) to remove them with the release switch.