Two of a bipedal mutant's arms or tentacles become legs or two of a quadruped's legs turn into arms. If a biped has more than two arms, only two of them change. The rest are unaffected. If a mutant has more than four legs, only two of them are affected. The rest of its limbs remain legs. Increase or decrease M by two, depending upon whether the mutant gained or lost legs. If a bipedal mutant had any weapon attacks and no longer has any arms, these are lost. Reduce A by the appropriate amount. A mutant with no arms also has a Dex of zero and loses any Dex-based skills.