Immovability: By carefully positioning his feet and learning to tense and relax various muscles, the martial artist can avoid being knocked down, lifted, or thrown off his feet. Any time an attack would result in one of these consequences, the character is automatically allowed a saving throw vs. paralyzation. If the save is successful, the character remains standing.
Weapons Allowed: Any. The character using immovability does not attack with these weapons, but uses them to brace himself. They confer no bonus to his immovability.